Remove VideoDecoder::natural_size() & added VideoFrame::natural_size().

media/base/video_decoder.h

Index: media/base/video_decoder.h
diff --git a/media/base/video_decoder.h b/media/base/video_decoder.h
index c55003325a4649e0cd5da4accee873462f78aafe..c8c19b7329395dd6c58b70d759d9277cb22a5cbb 100644
--- a/media/base/video_decoder.h
+++ b/media/base/video_decoder.h
@@ -60,15 +60,6 @@ class MEDIA_EXPORT VideoDecoder
   // should/could not be re-initialized after it has been stopped.
   virtual void Stop(const base::Closure& closure) = 0;
 
-  // Returns the natural width and height of decoded video in pixels.
-  //
-  // Clients should NOT rely on these values to remain constant. Instead, use
-  // the width/height from decoded video frames themselves.
-  //
-  // TODO(scherkus): why not rely on prerolling and decoding a single frame to
-  // get dimensions?
-  virtual const gfx::Size& natural_size() = 0;
-
   // Returns true if the output format has an alpha channel. Most formats do not
   // have alpha so the default is false. Override and return true for decoders
   // that return formats with an alpha channel.