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

content/renderer/renderer_blink_platform_impl.cc

Index: content/renderer/renderer_blink_platform_impl.cc
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 391a2a4827698dc770fa2280d0b7752b75df451a..4d69f7e07ab8d51b9d5a52d02a766b424e84f284 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -98,7 +98,6 @@
 
 #if defined(OS_ANDROID)
 #include "content/renderer/android/synchronous_compositor_factory.h"
-#include "content/renderer/media/android/audio_decoder_android.h"
 #include "gpu/blink/webgraphicscontext3d_in_process_command_buffer_impl.h"
 #endif
 
@@ -753,17 +752,6 @@ WebAudioDevice* RendererBlinkPlatformImpl::createAudioDevice(
   return new RendererWebAudioDeviceImpl(params, callback, session_id);
 }
 
-#if defined(OS_ANDROID)
-bool RendererBlinkPlatformImpl::loadAudioResource(
-    blink::WebAudioBus* destination_bus,
-    const char* audio_file_data,
-    size_t data_size) {
-  return DecodeAudioFileData(destination_bus,
-                             audio_file_data,
-                             data_size,
-                             thread_safe_sender_);
-}
-#else
 bool RendererBlinkPlatformImpl::loadAudioResource(
     blink::WebAudioBus* destination_bus,
     const char* audio_file_data,
@@ -771,7 +759,6 @@ bool RendererBlinkPlatformImpl::loadAudioResource(
   return DecodeAudioFileData(
       destination_bus, audio_file_data, data_size);
 }
-#endif  // defined(OS_ANDROID)
 
 //------------------------------------------------------------------------------