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

media/filters/gpu_video_decoder.h

Index: media/filters/gpu_video_decoder.h
diff --git a/media/filters/gpu_video_decoder.h b/media/filters/gpu_video_decoder.h
index 159381bfab3a3d70001b319f3b8c1970ab462527..d5488406363b487fae909dd92bdf974928f685ef 100644
--- a/media/filters/gpu_video_decoder.h
+++ b/media/filters/gpu_video_decoder.h
@@ -67,7 +67,6 @@
   // VideoDecodeAccelerator::Client implementation.
   void NotifyInitializationComplete(bool success) override;
   void ProvidePictureBuffers(uint32_t count,
-                             VideoPixelFormat format,
                              uint32_t textures_per_buffer,
                              const gfx::Size& size,
                              uint32_t texture_target) override;
@@ -196,9 +195,6 @@
   // The texture target used for decoded pictures.
   uint32_t decoder_texture_target_;
 
-  // The pixel format used for decoded pictures.
-  VideoPixelFormat pixel_format_;
-
   struct BufferData {
     BufferData(int32_t bbid,
                base::TimeDelta ts,