Delete VideoFrame default constructor, and 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 642 matching lines @@
 }
 
 int VP8EncoderImpl::Encode(const VideoFrame& frame,
                            const CodecSpecificInfo* codec_specific_info,
                            const std::vector<FrameType>* frame_types) {
   RTC_DCHECK_EQ(frame.width(), codec_.width);
   RTC_DCHECK_EQ(frame.height(), codec_.height);
 
   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();
   // Since we are extracting raw pointers from |input_image| to
   // |raw_images_[0]|, the resolution of these frames must match. Note that
   // |input_image| might be scaled from |frame|. In that case, the resolution of
   // |raw_images_[0]| should have been updated in UpdateCodecFrameSize.
   RTC_DCHECK_EQ(input_image->width(), raw_images_[0].d_w);
   RTC_DCHECK_EQ(input_image->height(), raw_images_[0].d_h);
@@ skipping 604 matching lines @@
     return -1;
   }
   if (vpx_codec_control(copy->decoder_, VP8_SET_REFERENCE, ref_frame_) !=
       VPX_CODEC_OK) {
     return -1;
   }
   return 0;
 }
 
 }  // namespace webrtc