Make IPC::Channel::Listener:OnMessageReceived have a return value indicating ...

chrome/renderer/gpu_video_decoder_host.cc

Index: chrome/renderer/gpu_video_decoder_host.cc
===================================================================
--- chrome/renderer/gpu_video_decoder_host.cc	(revision 70108)
+++ chrome/renderer/gpu_video_decoder_host.cc	(working copy)
@@ -32,7 +32,8 @@
   ipc_sender_ = NULL;
 }
 
-void GpuVideoDecoderHost::OnMessageReceived(const IPC::Message& msg) {
+bool GpuVideoDecoderHost::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(GpuVideoDecoderHost, msg)
     IPC_MESSAGE_HANDLER(GpuVideoDecoderHostMsg_CreateVideoDecoderDone,
                         OnCreateVideoDecoderDone)
@@ -54,8 +55,10 @@
                         OnAllocateVideoFrames)
     IPC_MESSAGE_HANDLER(GpuVideoDecoderHostMsg_ReleaseAllVideoFrames,
                         OnReleaseAllVideoFrames)
-    IPC_MESSAGE_UNHANDLED_ERROR()
+    IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
+  DCHECK(handled);
+  return handled;
 }
 
 void GpuVideoDecoderHost::Initialize(