Remove renderer_service -> media_client dependency.

media/mojo/services/default_mojo_media_client.cc

Index: media/mojo/services/default_mojo_media_client.cc
diff --git a/media/mojo/services/default_mojo_media_client.cc b/media/mojo/services/default_mojo_media_client.cc
index 47b6a36a015eb59503f98958e212ccf629955d88..0bf74f03f6ed3687cbf317eb9c1c45ed05031cef 100644
--- a/media/mojo/services/default_mojo_media_client.cc
+++ b/media/mojo/services/default_mojo_media_client.cc
@@ -55,10 +55,6 @@ class DefaultMojoMediaClient : public PlatformMojoMediaClient {
                           NullVideoSink::NewFrameCB(), task_runner));
   }
 
-  const AudioHardwareConfig* GetAudioHardwareConfig() override {
-    return audio_hardware_config_.get();
-  }
-
   scoped_ptr<CdmFactory> CreateCdmFactory(
       mojo::ServiceProvider* /* service_provider */) override {
     return make_scoped_ptr(new DefaultCdmFactory());