media: Use native BufferingState in media mojo interfaces

media/mojo/clients/mojo_renderer.cc

Index: media/mojo/clients/mojo_renderer.cc
diff --git a/media/mojo/clients/mojo_renderer.cc b/media/mojo/clients/mojo_renderer.cc
index ca83bdfbe40dcca3d2551e90ebd77256063d1d99..f22bfd2b8cc07ea6c3f71a74da2c6e57ce87ab8b 100644
--- a/media/mojo/clients/mojo_renderer.cc
+++ b/media/mojo/clients/mojo_renderer.cc
@@ -262,10 +262,10 @@ void MojoRenderer::OnTimeUpdate(base::TimeDelta time,
   media_time_interpolator_.SetBounds(time, max_time, capture_time);
 }
 
-void MojoRenderer::OnBufferingStateChange(mojom::BufferingState state) {
+void MojoRenderer::OnBufferingStateChange(BufferingState state) {
   DVLOG(2) << __FUNCTION__;
   DCHECK(task_runner_->BelongsToCurrentThread());
-  client_->OnBufferingStateChange(static_cast<media::BufferingState>(state));
+  client_->OnBufferingStateChange(state);
 }
 
 void MojoRenderer::OnEnded() {