ipc: Remove ipc_listener.h from ipc_channel.h and update the files.

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 31a57da8c843fd1f06460c1f0297e643b2952d1a..56137192702b1af339169c89ffe50d5720fd21a8 100644
--- a/content/test/webrtc_audio_device_test.h
+++ b/content/test/webrtc_audio_device_test.h
@@ -13,11 +13,15 @@
 #include "base/message_loop.h"
 #include "content/browser/renderer_host/media/mock_media_observer.h"
 #include "content/public/renderer/content_renderer_client.h"
+#include "ipc/ipc_listener.h"
 #include "media/base/channel_layout.h"
-#include "ipc/ipc_channel.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/webrtc/common_types.h"
 
+namespace IPC {
+class Channel;
+}
+
 namespace media {
 class AudioManager;
 }