Move content's shell connections to the IO thread

content/gpu/gpu_child_thread.h

Index: content/gpu/gpu_child_thread.h
diff --git a/content/gpu/gpu_child_thread.h b/content/gpu/gpu_child_thread.h
index 2141c7783e19940c4faebb35794256874b13c322..9d3e8f16314ba6e8f551012f8d35d274991852f2 100644
--- a/content/gpu/gpu_child_thread.h
+++ b/content/gpu/gpu_child_thread.h
@@ -87,9 +87,6 @@ class GpuChildThread : public ChildThreadImpl,
   bool Send(IPC::Message* msg) override;
   bool OnControlMessageReceived(const IPC::Message& msg) override;
   bool OnMessageReceived(const IPC::Message& msg) override;
-  bool AcceptConnection(shell::Connection* connection) override;
-  shell::InterfaceRegistry* GetInterfaceRegistryForConnection() override;
-  shell::InterfaceProvider* GetInterfaceProviderForConnection() override;
 
   // gpu::GpuChannelManagerDelegate:
   void SetActiveURL(const GURL& url) override;
@@ -179,8 +176,6 @@ class GpuChildThread : public ChildThreadImpl,
   // Bindings to the mojom::ProcessControl impl.
   mojo::BindingSet<mojom::ProcessControl> process_control_bindings_;
 
-  base::Closure resume_interface_bindings_callback_;
-
   DISALLOW_COPY_AND_ASSIGN(GpuChildThread);
 };