Delete IsZeroSize method.

webrtc/common_video/libyuv/webrtc_libyuv.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 88 matching lines @@
     if (fwrite(buf, 1, width, file) != static_cast<unsigned int>(width))
       return -1;
   }
   return 0;
 }
 
 // TODO(nisse): Belongs with the test code?
 int PrintVideoFrame(const VideoFrame& frame, FILE* file) {
   if (file == NULL)
     return -1;
-  if (frame.IsZeroSize())
-    return -1;
+
   int width = frame.video_frame_buffer()->width();
   int height = frame.video_frame_buffer()->height();
   int chroma_width = (width + 1) / 2;
   int chroma_height = (height + 1) / 2;
 
   if (PrintPlane(frame.video_frame_buffer()->DataY(), width, height,
                  frame.video_frame_buffer()->StrideY(), file) < 0) {
     return -1;
   }
   if (PrintPlane(frame.video_frame_buffer()->DataU(),
@@ skipping 214 matching lines @@
                           ref_frame->video_frame_buffer()->StrideV(),
                           test_frame->video_frame_buffer()->DataY(),
                           test_frame->video_frame_buffer()->StrideY(),
                           test_frame->video_frame_buffer()->DataU(),
                           test_frame->video_frame_buffer()->StrideU(),
                           test_frame->video_frame_buffer()->DataV(),
                           test_frame->video_frame_buffer()->StrideV(),
                           test_frame->width(), test_frame->height());
 }
 }  // namespace webrtc