gpu: Replace GpuMsg_Finalize ipc with equivalent mojom api

content/browser/gpu/gpu_process_host_ui_shim.h

Index: content/browser/gpu/gpu_process_host_ui_shim.h
diff --git a/content/browser/gpu/gpu_process_host_ui_shim.h b/content/browser/gpu/gpu_process_host_ui_shim.h
index 20321342f3a7ee0a535c2ab62815b57d6555c25b..95f2f17426b3ae7f2944f022950a43783ccca547 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.h
+++ b/content/browser/gpu/gpu_process_host_ui_shim.h
@@ -51,9 +51,6 @@ class GpuProcessHostUIShim : public IPC::Listener,
 
   CONTENT_EXPORT static GpuProcessHostUIShim* FromID(int host_id);
 
-  // Stops the GPU process.
-  CONTENT_EXPORT void StopGpuProcess(const base::Closure& callback);
-
   // IPC::Listener implementation.
   // The GpuProcessHost causes this to be called on the UI thread to
   // dispatch the incoming messages from the GPU process, which are
@@ -72,7 +69,6 @@ class GpuProcessHostUIShim : public IPC::Listener,
 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;
-  base::Closure close_callback_;
 };
 
 }  // namespace content