Remove unused flush operation from Chromium audio.

media/audio/audio_output_controller.cc

Index: media/audio/audio_output_controller.cc
diff --git a/media/audio/audio_output_controller.cc b/media/audio/audio_output_controller.cc
index 1d5f78ead808e64a3a49114871ecbd83c67a5a0a..28f01131b0d4844d16a86abd58a6a5a380b477bc 100644
--- a/media/audio/audio_output_controller.cc
+++ b/media/audio/audio_output_controller.cc
@@ -89,11 +89,6 @@ void AudioOutputController::Pause() {
       &AudioOutputController::DoPause, this));
 }
 
-void AudioOutputController::Flush() {
-  message_loop_->PostTask(FROM_HERE, base::Bind(
-      &AudioOutputController::DoFlush, this));
-}
-
 void AudioOutputController::Close(const base::Closure& closed_task) {
   DCHECK(!closed_task.is_null());
   message_loop_->PostTaskAndReply(FROM_HERE, base::Bind(
@@ -239,12 +234,6 @@ void AudioOutputController::DoPause() {
   handler_->OnPaused();
 }
 
-void AudioOutputController::DoFlush() {
-  DCHECK(message_loop_->BelongsToCurrentThread());
-
-  // TODO(hclam): Actually flush the audio device.
-}
-
 void AudioOutputController::DoClose() {
   DCHECK(message_loop_->BelongsToCurrentThread());