Delete large up-front allocation in LibvpxVp8Encoder::InitEncode

No longer useful after cl
https://webrtc-review.googlesource.com/c/src/+/155163

Bug: chromium:1012256,webrtc:9378
Change-Id: I2ee000b72add0b34933b7954ad7c8bf0d69fc88e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/156163
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29416}
diff --git a/modules/video_coding/codecs/vp8/libvpx_vp8_encoder.cc b/modules/video_coding/codecs/vp8/libvpx_vp8_encoder.cc
index ee5fd43..556ac60 100644
--- a/modules/video_coding/codecs/vp8/libvpx_vp8_encoder.cc
+++ b/modules/video_coding/codecs/vp8/libvpx_vp8_encoder.cc
@@ -27,7 +27,6 @@
 #include "api/video/video_timing.h"
 #include "api/video_codecs/vp8_temporal_layers.h"
 #include "api/video_codecs/vp8_temporal_layers_factory.h"
-#include "common_video/libyuv/include/webrtc_libyuv.h"
 #include "modules/video_coding/codecs/interface/common_constants.h"
 #include "modules/video_coding/codecs/vp8/include/vp8.h"
 #include "modules/video_coding/include/video_error_codes.h"
@@ -537,11 +536,6 @@
     downsampling_factors_[number_of_streams - 1].den = 1;
   }
   for (int i = 0; i < number_of_streams; ++i) {
-    // allocate memory for encoded image
-    size_t frame_capacity =
-        CalcBufferSize(VideoType::kI420, codec_.width, codec_.height);
-    encoded_images_[i].SetEncodedData(
-        EncodedImageBuffer::Create(frame_capacity));
     encoded_images_[i]._completeFrame = true;
   }
   // populate encoder configuration with default values