Revert of Plumb decoded video pixel format from GPU process to renderer.

media/video/video_decode_accelerator.h

Index: media/video/video_decode_accelerator.h
diff --git a/media/video/video_decode_accelerator.h b/media/video/video_decode_accelerator.h
index 27eb5905f0c9898bcaf1ae7bbc806f2b37c10228..84f14fdce42bfc12c5e9d4cc0caf866507b9ac99 100644
--- a/media/video/video_decode_accelerator.h
+++ b/media/video/video_decode_accelerator.h
@@ -167,11 +167,7 @@
     // Callback to tell client how many and what size of buffers to provide.
     // Note that the actual count provided through AssignPictureBuffers() can be
     // larger than the value requested.
-    // |format| indicates what format the decoded frames will be produced in
-    // by the VDA, or PIXEL_FORMAT_UNKNOWN if the underlying platform handles
-    // this transparently.
     virtual void ProvidePictureBuffers(uint32_t requested_num_of_buffers,
-                                       VideoPixelFormat format,
                                        uint32_t textures_per_buffer,
                                        const gfx::Size& dimensions,
                                        uint32_t texture_target) = 0;
@@ -321,6 +317,10 @@
   // TODO(dshwang): after moving to D3D11, remove this. crbug.com/438691
   virtual GLenum GetSurfaceInternalFormat() const;
 
+  // In IMPORT OutputMode, if supported by the VDA, return the format that it
+  // requires for imported picture buffers.
+  virtual VideoPixelFormat GetOutputFormat() const;
+
  protected:
   // Do not delete directly; use Destroy() or own it with a scoped_ptr, which
   // will Destroy() it properly by default.