Fixing WebRTC after moving from src/webrtc to src/

In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC
from src/webrtc to src/ (in order to preserve an healthy git history).
This CL takes care of fixing header guards, #include paths, etc...

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org


Bug: chromium:611808
Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578
Reviewed-on: https://webrtc-review.googlesource.com/1561
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19846}
diff --git a/test/frame_generator.h b/test/frame_generator.h
index d42f226..58b8a2b 100644
--- a/test/frame_generator.h
+++ b/test/frame_generator.h
@@ -7,17 +7,17 @@
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
-#ifndef WEBRTC_TEST_FRAME_GENERATOR_H_
-#define WEBRTC_TEST_FRAME_GENERATOR_H_
+#ifndef TEST_FRAME_GENERATOR_H_
+#define TEST_FRAME_GENERATOR_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
-#include "webrtc/api/video/video_frame.h"
-#include "webrtc/media/base/videosourceinterface.h"
-#include "webrtc/rtc_base/criticalsection.h"
-#include "webrtc/typedefs.h"
+#include "api/video/video_frame.h"
+#include "media/base/videosourceinterface.h"
+#include "rtc_base/criticalsection.h"
+#include "typedefs.h"
 
 namespace webrtc {
 class Clock;
@@ -98,4 +98,4 @@
 }  // namespace test
 }  // namespace webrtc
 
-#endif  // WEBRTC_TEST_FRAME_GENERATOR_H_
+#endif  // TEST_FRAME_GENERATOR_H_