Delete IsZeroSize method.

webrtc/common_video/i420_video_frame_unittest.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 68 matching lines @@
       EXPECT_NEAR(frame->DataV()[x / 2 + (y / 2) * frame->StrideV()] / 256.0,
                   orig_y, 0.02);
     }
   }
 }
 
 }  // namespace
 
 TEST(TestVideoFrame, InitialValues) {
   VideoFrame frame;
-  EXPECT_TRUE(frame.IsZeroSize());
+  EXPECT_TRUE(!frame.video_frame_buffer());
   EXPECT_EQ(kVideoRotation_0, frame.rotation());
 }
 
 TEST(TestVideoFrame, CopiesInitialFrameWithoutCrashing) {
   VideoFrame frame;
   VideoFrame frame2;
   frame2.CopyFrame(frame);
 }
 
 TEST(TestVideoFrame, WidthHeightValues) {
@@ skipping 264 matching lines @@
 
   // Center crop to 640 x 360 (16/9 aspect), then scale down by 2.
   rtc::scoped_refptr<I420Buffer> scaled_buffer(
       I420Buffer::Create(320, 180));
 
   scaled_buffer->CropAndScaleFrom(buf);
   CheckCrop(scaled_buffer, 0.0, 0.125, 1.0, 0.75);
 }
 
 }  // namespace webrtc