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

webrtc/video/video_capture_input_unittest.cc

Index: webrtc/video/video_capture_input_unittest.cc
diff --git a/webrtc/video/video_capture_input_unittest.cc b/webrtc/video/video_capture_input_unittest.cc
index 2da722b47d4db297b4414084a005a6d07ec918a3..8ec89c7f2996bc43bf56f09b709f3af53ed79dd4 100644
--- a/webrtc/video/video_capture_input_unittest.cc
+++ b/webrtc/video/video_capture_input_unittest.cc
@@ -54,7 +54,8 @@
     EXPECT_TRUE(input_->GetVideoFrame(&frame));
     ASSERT_TRUE(frame.video_frame_buffer());
     if (!frame.video_frame_buffer()->native_handle()) {
-      output_frame_ybuffers_.push_back(frame.video_frame_buffer()->DataY());
+      output_frame_ybuffers_.push_back(
+          static_cast<const VideoFrame*>(&frame)->buffer(kYPlane));
     }
     output_frames_.push_back(
         std::unique_ptr<VideoFrame>(new VideoFrame(frame)));
@@ -180,7 +181,8 @@
   std::vector<const uint8_t*> ybuffer_pointers;
   for (int i = 0; i < kNumFrame; ++i) {
     input_frames_.push_back(CreateVideoFrame(static_cast<uint8_t>(i + 1)));
-    ybuffer_pointers.push_back(input_frames_[i]->video_frame_buffer()->DataY());
+    const VideoFrame* const_input_frame = input_frames_[i].get();
+    ybuffer_pointers.push_back(const_input_frame->buffer(kYPlane));
     AddInputFrame(input_frames_[i].get());
     WaitOutputFrame();
   }