Revert of Delete webrtc::VideoFrame methods buffer and stride.

webrtc/modules/video_processing/test/video_processing_unittest.cc

Index: webrtc/modules/video_processing/test/video_processing_unittest.cc
diff --git a/webrtc/modules/video_processing/test/video_processing_unittest.cc b/webrtc/modules/video_processing/test/video_processing_unittest.cc
index 9e61b51884f75a41532eaf242319314ee2481b38..2d0c68611ea5da8d1d93e937675dafe5e4cdea8d 100644
--- a/webrtc/modules/video_processing/test/video_processing_unittest.cc
+++ b/webrtc/modules/video_processing/test/video_processing_unittest.cc
@@ -71,12 +71,9 @@
   video_frame_.CreateEmptyFrame(width_, height_, width_,
                                 half_width_, half_width_);
   // Clear video frame so DrMemory/Valgrind will allow reads of the buffer.
-  memset(video_frame_.video_frame_buffer()->MutableDataY(), 0,
-         video_frame_.allocated_size(kYPlane));
-  memset(video_frame_.video_frame_buffer()->MutableDataU(), 0,
-         video_frame_.allocated_size(kUPlane));
-  memset(video_frame_.video_frame_buffer()->MutableDataV(), 0,
-         video_frame_.allocated_size(kVPlane));
+  memset(video_frame_.buffer(kYPlane), 0, video_frame_.allocated_size(kYPlane));
+  memset(video_frame_.buffer(kUPlane), 0, video_frame_.allocated_size(kUPlane));
+  memset(video_frame_.buffer(kVPlane), 0, video_frame_.allocated_size(kVPlane));
   const std::string video_file =
       webrtc::test::ResourcePath("foreman_cif", "yuv");
   source_file_ = fopen(video_file.c_str(), "rb");