Update content module for IPC attachment brokering.

content/common/gpu/client/gpu_channel_host.cc

Index: content/common/gpu/client/gpu_channel_host.cc
diff --git a/content/common/gpu/client/gpu_channel_host.cc b/content/common/gpu/client/gpu_channel_host.cc
index 60c5bbe40b3cb16ce4904017d2a7dae1996c650c..7bd55f9b7d8ab6f4337e672f3f50386bee8cf320 100644
--- a/content/common/gpu/client/gpu_channel_host.cc
+++ b/content/common/gpu/client/gpu_channel_host.cc
@@ -73,9 +73,9 @@ void GpuChannelHost::Connect(const IPC::ChannelHandle& channel_handle,
   // since we need to filter everything to route it to the right thread.
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner =
       factory_->GetIOThreadTaskRunner();
-  channel_ =
-      IPC::SyncChannel::Create(channel_handle, IPC::Channel::MODE_CLIENT, NULL,
-                               io_task_runner.get(), true, shutdown_event);
+  channel_ = IPC::SyncChannel::Create(
+      channel_handle, IPC::Channel::MODE_CLIENT, NULL, io_task_runner.get(),
+      true, shutdown_event, factory_->GetAttachmentBroker());
 
   sync_filter_ = new IPC::SyncMessageFilter(shutdown_event);