Delete unused deprecated headers under modules/video_coding/

Apparently left over since 2015 refactorings, see cl
https://codereview.webrtc.org/1417283007

Bug: webrtc:5095
Change-Id: I899f2c018d1906b4336b2e80b511f7398bac4947
Reviewed-on: https://webrtc-review.googlesource.com/53200
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22055}
diff --git a/modules/video_coding/BUILD.gn b/modules/video_coding/BUILD.gn
index 6dd7305..9d87d09 100644
--- a/modules/video_coding/BUILD.gn
+++ b/modules/video_coding/BUILD.gn
@@ -151,7 +151,6 @@
 rtc_source_set("mock_headers") {
   testonly = true
   sources = [
-    "codecs/interface/mock/mock_video_codec_interface.h",
     "include/mock/mock_video_codec_interface.h",
   ]
   deps = [
@@ -175,8 +174,6 @@
 rtc_source_set("video_coding_utility") {
   visibility = [ "*" ]
   sources = [
-    "codecs/interface/video_codec_interface.h",
-    "codecs/interface/video_error_codes.h",
     "utility/default_video_bitrate_allocator.cc",
     "utility/default_video_bitrate_allocator.h",
     "utility/frame_dropper.cc",
diff --git a/modules/video_coding/codecs/interface/mock/mock_video_codec_interface.h b/modules/video_coding/codecs/interface/mock/mock_video_codec_interface.h
deleted file mode 100644
index 5f5880a..0000000
--- a/modules/video_coding/codecs/interface/mock/mock_video_codec_interface.h
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef MODULES_VIDEO_CODING_CODECS_INTERFACE_MOCK_MOCK_VIDEO_CODEC_INTERFACE_H_
-#define MODULES_VIDEO_CODING_CODECS_INTERFACE_MOCK_MOCK_VIDEO_CODEC_INTERFACE_H_
-
-#pragma message("WARNING: video_coding/codecs/interface is DEPRECATED; "
-    "use video_coding/include")
-#include <string>
-#include <vector>
-
-#include "modules/video_coding/include/video_codec_interface.h"
-#include "test/gmock.h"
-#include "typedefs.h"  // NOLINT(build/include)
-
-namespace webrtc {
-
-class MockEncodedImageCallback : public EncodedImageCallback {
- public:
-  MOCK_METHOD3(Encoded,
-               int32_t(const EncodedImage& encodedImage,
-                       const CodecSpecificInfo* codecSpecificInfo,
-                       const RTPFragmentationHeader* fragmentation));
-};
-
-class MockVideoEncoder : public VideoEncoder {
- public:
-  MOCK_CONST_METHOD2(Version, int32_t(int8_t* version, int32_t length));
-  MOCK_METHOD3(InitEncode,
-               int32_t(const VideoCodec* codecSettings,
-                       int32_t numberOfCores,
-                       size_t maxPayloadSize));
-  MOCK_METHOD3(Encode,
-               int32_t(const VideoFrame& inputImage,
-                       const CodecSpecificInfo* codecSpecificInfo,
-                       const std::vector<FrameType>* frame_types));
-  MOCK_METHOD1(RegisterEncodeCompleteCallback,
-               int32_t(EncodedImageCallback* callback));
-  MOCK_METHOD0(Release, int32_t());
-  MOCK_METHOD0(Reset, int32_t());
-  MOCK_METHOD2(SetChannelParameters, int32_t(uint32_t packetLoss, int64_t rtt));
-  MOCK_METHOD2(SetRates, int32_t(uint32_t newBitRate, uint32_t frameRate));
-  MOCK_METHOD1(SetPeriodicKeyFrames, int32_t(bool enable));
-};
-
-class MockDecodedImageCallback : public DecodedImageCallback {
- public:
-  MOCK_METHOD1(Decoded, int32_t(const VideoFrame& decodedImage));
-  MOCK_METHOD2(Decoded,
-               int32_t(const VideoFrame& decodedImage, int64_t decode_time_ms));
-  MOCK_METHOD1(ReceivedDecodedReferenceFrame,
-               int32_t(const uint64_t pictureId));
-  MOCK_METHOD1(ReceivedDecodedFrame, int32_t(const uint64_t pictureId));
-};
-
-class MockVideoDecoder : public VideoDecoder {
- public:
-  MOCK_METHOD2(InitDecode,
-               int32_t(const VideoCodec* codecSettings, int32_t numberOfCores));
-  MOCK_METHOD5(Decode,
-               int32_t(const EncodedImage& inputImage,
-                       bool missingFrames,
-                       const RTPFragmentationHeader* fragmentation,
-                       const CodecSpecificInfo* codecSpecificInfo,
-                       int64_t renderTimeMs));
-  MOCK_METHOD1(RegisterDecodeCompleteCallback,
-               int32_t(DecodedImageCallback* callback));
-  MOCK_METHOD0(Release, int32_t());
-  MOCK_METHOD0(Copy, VideoDecoder*());
-};
-
-}  // namespace webrtc
-
-#endif  // MODULES_VIDEO_CODING_CODECS_INTERFACE_MOCK_MOCK_VIDEO_CODEC_INTERFACE_H_
diff --git a/modules/video_coding/codecs/interface/video_codec_interface.h b/modules/video_coding/codecs/interface/video_codec_interface.h
deleted file mode 100644
index 682fde6..0000000
--- a/modules/video_coding/codecs/interface/video_codec_interface.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef MODULES_VIDEO_CODING_CODECS_INTERFACE_VIDEO_CODEC_INTERFACE_H_
-#define MODULES_VIDEO_CODING_CODECS_INTERFACE_VIDEO_CODEC_INTERFACE_H_
-
-#pragma message("WARNING: video_coding/codecs/interface is DEPRECATED; "
-    "use video_coding/include")
-
-#include "modules/video_coding/include/video_codec_interface.h"
-
-#endif  // MODULES_VIDEO_CODING_CODECS_INTERFACE_VIDEO_CODEC_INTERFACE_H_
diff --git a/modules/video_coding/codecs/interface/video_error_codes.h b/modules/video_coding/codecs/interface/video_error_codes.h
deleted file mode 100644
index 582d309..0000000
--- a/modules/video_coding/codecs/interface/video_error_codes.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef MODULES_VIDEO_CODING_CODECS_INTERFACE_VIDEO_ERROR_CODES_H_
-#define MODULES_VIDEO_CODING_CODECS_INTERFACE_VIDEO_ERROR_CODES_H_
-
-#pragma message("WARNING: video_coding/codecs/interface is DEPRECATED; "
-    "use video_coding/include")
-
-// NOTE: in sync with video_coding_module_defines.h
-
-// Define return values
-
-#define WEBRTC_VIDEO_CODEC_REQUEST_SLI 2
-#define WEBRTC_VIDEO_CODEC_NO_OUTPUT 1
-#define WEBRTC_VIDEO_CODEC_OK 0
-#define WEBRTC_VIDEO_CODEC_ERROR -1
-#define WEBRTC_VIDEO_CODEC_LEVEL_EXCEEDED -2
-#define WEBRTC_VIDEO_CODEC_MEMORY -3
-#define WEBRTC_VIDEO_CODEC_ERR_PARAMETER -4
-#define WEBRTC_VIDEO_CODEC_ERR_SIZE -5
-#define WEBRTC_VIDEO_CODEC_TIMEOUT -6
-#define WEBRTC_VIDEO_CODEC_UNINITIALIZED -7
-#define WEBRTC_VIDEO_CODEC_ERR_REQUEST_SLI -12
-#define WEBRTC_VIDEO_CODEC_FALLBACK_SOFTWARE -13
-#define WEBRTC_VIDEO_CODEC_TARGET_BITRATE_OVERSHOOT -14
-
-#endif  // MODULES_VIDEO_CODING_CODECS_INTERFACE_VIDEO_ERROR_CODES_H_