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

content/renderer/media/rtc_video_decoder.h

Index: content/renderer/media/rtc_video_decoder.h
diff --git a/content/renderer/media/rtc_video_decoder.h b/content/renderer/media/rtc_video_decoder.h
index a9f8872925197332132b204a9cbf3efc70121f1e..68d1c4baa760a3b4280a0d833fb1dc12c7e87c19 100644
--- a/content/renderer/media/rtc_video_decoder.h
+++ b/content/renderer/media/rtc_video_decoder.h
@@ -82,7 +82,6 @@
 
   // VideoDecodeAccelerator::Client implementation.
   void ProvidePictureBuffers(uint32_t count,
-                             media::VideoPixelFormat format,
                              uint32_t textures_per_buffer,
                              const gfx::Size& size,
                              uint32_t texture_target) override;
@@ -234,9 +233,6 @@
   // The texture target used for decoded pictures.
   uint32_t decoder_texture_target_;
 
-  // The format of the decoded pictures.
-  media::VideoPixelFormat pixel_format_;
-
   // Metadata of the buffers that have been sent for decode.
   std::list<BufferData> input_buffer_data_;