Get rid of last gpu_messages.h dependency in chrome by having chrome ask the GPUProcessHostUIShim...

content/browser/gpu/gpu_process_host_ui_shim.cc

Index: content/browser/gpu/gpu_process_host_ui_shim.cc
===================================================================
--- content/browser/gpu/gpu_process_host_ui_shim.cc	(revision 110530)
+++ content/browser/gpu/gpu_process_host_ui_shim.cc	(working copy)
@@ -147,6 +147,18 @@
   return OnControlMessageReceived(message);
 }
 
+void GpuProcessHostUIShim::SimulateRemoveAllContext() {
+  Send(new GpuMsg_Clean());
+}
+
+void GpuProcessHostUIShim::SimulateCrash() {
+  Send(new GpuMsg_Crash());
+}
+
+void GpuProcessHostUIShim::SimulateHang() {
+  Send(new GpuMsg_Hang());
+}
+
 #if defined(OS_MACOSX) || defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
 
 void GpuProcessHostUIShim::SendToGpuHost(int host_id, IPC::Message* msg) {