Replace WebAudio MediaCodec usage with FFmpeg. A ~4x improvement.

content/renderer/media/android/audio_decoder_android.h

Index: content/renderer/media/android/audio_decoder_android.h
diff --git a/content/renderer/media/android/audio_decoder_android.h b/content/renderer/media/android/audio_decoder_android.h
deleted file mode 100644
index 3f4c45bc19d59431669985fdfdb58ad934b780a6..0000000000000000000000000000000000000000
--- a/content/renderer/media/android/audio_decoder_android.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_RENDERER_MEDIA_ANDROID_AUDIO_DECODER_ANDROID_H_
-#define CONTENT_RENDERER_MEDIA_ANDROID_AUDIO_DECODER_ANDROID_H_
-
-#include <stddef.h>
-
-#include "content/child/thread_safe_sender.h"
-
-namespace blink {
-class WebAudioBus;
-}
-
-namespace content {
-
-bool DecodeAudioFileData(blink::WebAudioBus* destination_bus,
-                         const char* data,
-                         size_t data_size,
-                         scoped_refptr<ThreadSafeSender> sender);
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_ANDROID_AUDIO_DECODER_ANDROID_H_