gpu: Use mojom API for getting video memory usage.

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 7ac670434f304c1dbeba9e02dc11d536142150ad..e8605b8f7156ef1f817020bf5395dd27f582da65 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.h
+++ b/content/browser/gpu/gpu_process_host_ui_shim.h
@@ -31,10 +31,6 @@ namespace IPC {
 class Message;
 }
 
-namespace gpu {
-struct VideoMemoryUsageStats;
-}
-
 namespace content {
 void RouteToGpuProcessHostUIShimTask(int host_id, const IPC::Message& msg);
 
@@ -88,8 +84,6 @@ class GpuProcessHostUIShim : public IPC::Listener,
   void OnLogMessage(int level, const std::string& header,
       const std::string& message);
   void OnGraphicsInfoCollected(const gpu::GPUInfo& gpu_info);
-  void OnVideoMemoryUsageStatsReceived(
-      const gpu::VideoMemoryUsageStats& video_memory_usage_stats);
 
   // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
   int host_id_;