Delete IsZeroSize method.

webrtc/modules/video_coding/codecs/vp8/vp8_impl.cc

 /*
  *  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.
  */
 
@@ skipping 721 matching lines @@
   // Don't go below 3 times the per frame bandwidth.
   const uint32_t minIntraTh = 300;
   return (targetPct < minIntraTh) ? minIntraTh : targetPct;
 }
 
 int VP8EncoderImpl::Encode(const VideoFrame& frame,
                            const CodecSpecificInfo* codec_specific_info,
                            const std::vector<FrameType>* frame_types) {
   if (!inited_)
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
-  if (frame.IsZeroSize())
-    return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   if (encoded_complete_callback_ == NULL)
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
 
   rtc::scoped_refptr<VideoFrameBuffer> input_image = frame.video_frame_buffer();
 
   if (quality_scaler_enabled_) {
     quality_scaler_.OnEncodeFrame(frame.width(), frame.height());
     input_image = quality_scaler_.GetScaledBuffer(input_image);
 
     if (input_image->width() != codec_.width ||
@@ skipping 650 matching lines @@
     return -1;
   }
   if (vpx_codec_control(copy->decoder_, VP8_SET_REFERENCE, ref_frame_) !=
       VPX_CODEC_OK) {
     return -1;
   }
   return 0;
 }
 
 }  // namespace webrtc