Revert of Move MutableDataY{,U,V} methods to I420Buffer only.

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

 /*
  *  Copyright (c) 2014 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 517 matching lines @@
       &codec_, static_cast<const int*>(kTestTemporalLayerProfile));
   codec_.numberOfSimulcastStreams = 3;
   EXPECT_EQ(0, adapter_->InitEncode(&codec_, 1, 1200));
   adapter_->RegisterEncodeCompleteCallback(this);
   ASSERT_EQ(3u, helper_->factory()->encoders().size());
   // Tell the 2nd encoder to request software fallback.
   EXPECT_CALL(*helper_->factory()->encoders()[1], Encode(_, _, _))
       .WillOnce(Return(WEBRTC_VIDEO_CODEC_FALLBACK_SOFTWARE));
 
   // Send a fake frame and assert the return is software fallback.
+  VideoFrame input_frame;
   int half_width = (kDefaultWidth + 1) / 2;
-  rtc::scoped_refptr<I420Buffer> input_buffer = I420Buffer::Create(
-      kDefaultWidth, kDefaultHeight, kDefaultWidth, half_width, half_width);
-  input_buffer->InitializeData();
-  VideoFrame input_frame(input_buffer, 0, 0, webrtc::kVideoRotation_0);
+  input_frame.CreateEmptyFrame(kDefaultWidth, kDefaultHeight, kDefaultWidth,
+                                half_width, half_width);
+  memset(input_frame.video_frame_buffer()->MutableDataY(), 0,
+         input_frame.allocated_size(kYPlane));
+  memset(input_frame.video_frame_buffer()->MutableDataU(), 0,
+         input_frame.allocated_size(kUPlane));
+  memset(input_frame.video_frame_buffer()->MutableDataV(), 0,
+         input_frame.allocated_size(kVPlane));
+
   std::vector<FrameType> frame_types(3, kVideoFrameKey);
   EXPECT_EQ(WEBRTC_VIDEO_CODEC_FALLBACK_SOFTWARE,
             adapter_->Encode(input_frame, nullptr, &frame_types));
 }
 
 }  // namespace testing
 }  // namespace webrtc