Use IPC::Sender and IPC::Listener in content.

content/test/webrtc_audio_device_test.h

Index: content/test/webrtc_audio_device_test.h
diff --git a/content/test/webrtc_audio_device_test.h b/content/test/webrtc_audio_device_test.h
index 6045d79ab10dd4e91949e55113926c89da83d6c9..a23bf3d2f0c2e51660e614e179ddc19e18a16c4a 100644
--- a/content/test/webrtc_audio_device_test.h
+++ b/content/test/webrtc_audio_device_test.h
@@ -122,9 +122,7 @@ class AudioUtilInterface {
 // Implemented and defined in the cc file.
 class ReplaceContentClientRenderer;
 
-class WebRTCAudioDeviceTest
-    : public ::testing::Test,
-      public IPC::Channel::Listener {
+class WebRTCAudioDeviceTest : public ::testing::Test, public IPC::Listener {
  public:
   WebRTCAudioDeviceTest();
   virtual ~WebRTCAudioDeviceTest();
@@ -147,7 +145,7 @@ class WebRTCAudioDeviceTest
   void OnGetHardwareInputSampleRate(int* sample_rate);
   void OnGetHardwareInputChannelLayout(ChannelLayout* channels);
 
-  // IPC::Channel::Listener implementation.
+  // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Posts a final task to the IO message loop and waits for completion.