Introduce AudioIPCFactory.

content/renderer/media/audio_device_factory.cc

Index: content/renderer/media/audio_device_factory.cc
diff --git a/content/renderer/media/audio_device_factory.cc b/content/renderer/media/audio_device_factory.cc
index e83ca0fab5458495eb578981cdeb9739149d8682..7f72d259d0721d20607cc252dfd8bb5961ae3336 100644
--- a/content/renderer/media/audio_device_factory.cc
+++ b/content/renderer/media/audio_device_factory.cc
@@ -11,7 +11,7 @@
 #include "build/build_config.h"
 #include "content/common/content_constants_internal.h"
 #include "content/renderer/media/audio_input_message_filter.h"
-#include "content/renderer/media/audio_message_filter.h"
+#include "content/renderer/media/audio_ipc_factory.h"
 #include "content/renderer/media/audio_renderer_mixer_manager.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/audio/audio_input_device.h"
@@ -43,14 +43,14 @@ scoped_refptr<media::AudioOutputDevice> NewOutputDevice(
     int session_id,
     const std::string& device_id,
     const url::Origin& security_origin) {
-  AudioMessageFilter* const filter = AudioMessageFilter::Get();
-  scoped_refptr<media::AudioOutputDevice> device(new media::AudioOutputDevice(
-      filter->CreateAudioOutputIPC(render_frame_id), filter->io_task_runner(),
-      session_id, device_id, security_origin,
-      // Set authorization request timeout at 80% of renderer hung timeout, but
-      // no more than kMaxAuthorizationTimeout.
-      base::TimeDelta::FromMilliseconds(std::min(kHungRendererDelayMs * 8 / 10,
-                                                 kMaxAuthorizationTimeoutMs))));
+  auto device = base::MakeRefCounted<media::AudioOutputDevice>(
+      AudioIPCFactory::get()->CreateAudioOutputIPC(render_frame_id),
+      AudioIPCFactory::get()->io_task_runner(), session_id, device_id,
+      security_origin,
+      // Set authorization request timeout at 80% of renderer hung timeout,
+      // but no more than kMaxAuthorizationTimeout.
+      base::TimeDelta::FromMilliseconds(
+          std::min(kHungRendererDelayMs * 8 / 10, kMaxAuthorizationTimeoutMs)));
   device->RequestDeviceAuthorization();
   return device;
 }