Decouple IPC::MessageFilter from IPC::Channel

content/browser/renderer_host/media/audio_renderer_host_unittest.cc

Index: content/browser/renderer_host/media/audio_renderer_host_unittest.cc
diff --git a/content/browser/renderer_host/media/audio_renderer_host_unittest.cc b/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
index 343c9890810ed2e6271dcc20dbb11986c1287d3c..401f183723425a14e579910ab715bed0ba351ed9 100644
--- a/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
+++ b/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
@@ -7,6 +7,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "base/sync_socket.h"
+#include "content/browser/browser_message_filter_peer.h"
 #include "content/browser/media/capture/audio_mirroring_manager.h"
 #include "content/browser/media/media_internals.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
@@ -166,13 +167,14 @@ class AudioRendererHostTest : public testing::Test {
                                       media_stream_manager_.get());
 
     // Simulate IPC channel connected.
-    host_->set_peer_pid_for_testing(base::GetCurrentProcId());
+    host_peer_.reset(new BrowserMessageFilterPeer(base::GetCurrentProcId()));
+    host_->OnFilterAddedToHost(host_peer_.get());
   }
 
   virtual ~AudioRendererHostTest() {
     // Simulate closing the IPC channel and give the audio thread time to close
     // the underlying streams.
-    host_->OnChannelClosing();
+    host_->OnSenderClosing();
     SyncWithAudioThread();
 
     // Release the reference to the mock object.  The object will be destructed
@@ -282,6 +284,7 @@ class AudioRendererHostTest : public testing::Test {
   scoped_ptr<media::AudioManager> audio_manager_;
   MockAudioMirroringManager mirroring_manager_;
   scoped_refptr<MockAudioRendererHost> host_;
+  scoped_ptr<BrowserMessageFilterPeer> host_peer_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererHostTest);
 };