content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/renderer/pepper/pepper_platform_audio_output.h

Index: content/renderer/pepper/pepper_platform_audio_output.h
diff --git a/content/renderer/pepper/pepper_platform_audio_output.h b/content/renderer/pepper/pepper_platform_audio_output.h
index c0f455b592d96e121d22678d69db41fd8565009f..91b922b5c1f9026e08c8451cf63e6807c76e37b6 100644
--- a/content/renderer/pepper/pepper_platform_audio_output.h
+++ b/content/renderer/pepper/pepper_platform_audio_output.h
@@ -16,6 +16,7 @@ class AudioParameters;
 
 namespace base {
 class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace content {
@@ -81,7 +82,7 @@ class PepperPlatformAudioOutput
   scoped_ptr<media::AudioOutputIPC> ipc_;
 
   scoped_refptr<base::MessageLoopProxy> main_message_loop_proxy_;
-  scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPlatformAudioOutput);
 };