Revert of media/vpx: Add support for VP9 alpha channel

media/base/video_frame.cc

Index: media/base/video_frame.cc
diff --git a/media/base/video_frame.cc b/media/base/video_frame.cc
index e0f8ba82007af76e34012633837c4ee70dc54943..aad4969e61541effbf31541a825dad83ba59e32b 100644
--- a/media/base/video_frame.cc
+++ b/media/base/video_frame.cc
@@ -375,48 +375,6 @@
   return frame;
 }
 
-// static
-scoped_refptr<VideoFrame> VideoFrame::WrapExternalYuvaData(
-    VideoPixelFormat format,
-    const gfx::Size& coded_size,
-    const gfx::Rect& visible_rect,
-    const gfx::Size& natural_size,
-    int32_t y_stride,
-    int32_t u_stride,
-    int32_t v_stride,
-    int32_t a_stride,
-    uint8_t* y_data,
-    uint8_t* u_data,
-    uint8_t* v_data,
-    uint8_t* a_data,
-    base::TimeDelta timestamp) {
-  const StorageType storage = STORAGE_UNOWNED_MEMORY;
-  if (!IsValidConfig(format, storage, coded_size, visible_rect, natural_size)) {
-    LOG(DFATAL) << __FUNCTION__ << " Invalid config."
-                << ConfigToString(format, storage, coded_size, visible_rect,
-                                  natural_size);
-    return nullptr;
-  }
-
-  if (NumPlanes(format) != 4) {
-    LOG(DFATAL) << "Expecting Y, U, V and A planes to be present for the video"
-                << " format.";
-    return nullptr;
-  }
-
-  scoped_refptr<VideoFrame> frame(new VideoFrame(
-      format, storage, coded_size, visible_rect, natural_size, timestamp));
-  frame->strides_[kYPlane] = y_stride;
-  frame->strides_[kUPlane] = u_stride;
-  frame->strides_[kVPlane] = v_stride;
-  frame->strides_[kAPlane] = a_stride;
-  frame->data_[kYPlane] = y_data;
-  frame->data_[kUPlane] = u_data;
-  frame->data_[kVPlane] = v_data;
-  frame->data_[kAPlane] = a_data;
-  return frame;
-}
-
 #if defined(OS_LINUX)
 // static
 scoped_refptr<VideoFrame> VideoFrame::WrapExternalDmabufs(