message: Delete large up-front allocation in LibvpxVp8Encoder::InitEncode
  No longer useful after cl
  Cr-Commit-Position: refs/heads/master@{#29416}
diff: #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 @@ int LibvpxVp8Encoder::InitEncode(const VideoCodec* inst,
  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
  