gpu: Use mojom API for getting video memory usage.

content/gpu/gpu_child_thread.cc

Index: content/gpu/gpu_child_thread.cc
diff --git a/content/gpu/gpu_child_thread.cc b/content/gpu/gpu_child_thread.cc
index f3f04ff4dc470ea2abcaa275c4f4da605dd92292..da3646ab674dc4a60753af39cbad055cd753c567 100644
--- a/content/gpu/gpu_child_thread.cc
+++ b/content/gpu/gpu_child_thread.cc
@@ -250,8 +250,6 @@ bool GpuChildThread::OnControlMessageReceived(const IPC::Message& msg) {
   IPC_BEGIN_MESSAGE_MAP(GpuChildThread, msg)
     IPC_MESSAGE_HANDLER(GpuMsg_Finalize, OnFinalize)
     IPC_MESSAGE_HANDLER(GpuMsg_CollectGraphicsInfo, OnCollectGraphicsInfo)
-    IPC_MESSAGE_HANDLER(GpuMsg_GetVideoMemoryUsageStats,
-                        OnGetVideoMemoryUsageStats)
     IPC_MESSAGE_HANDLER(GpuMsg_Clean, OnClean)
     IPC_MESSAGE_HANDLER(GpuMsg_Crash, OnCrash)
     IPC_MESSAGE_HANDLER(GpuMsg_Hang, OnHang)
@@ -423,15 +421,6 @@ void GpuChildThread::OnCollectGraphicsInfo() {
 #endif  // OS_WIN
 }
 
-void GpuChildThread::OnGetVideoMemoryUsageStats() {
-  gpu::VideoMemoryUsageStats video_memory_usage_stats;
-  if (gpu_channel_manager()) {
-    gpu_channel_manager()->gpu_memory_manager()->GetVideoMemoryUsageStats(
-        &video_memory_usage_stats);
-  }
-  Send(new GpuHostMsg_VideoMemoryUsageStats(video_memory_usage_stats));
-}
-
 void GpuChildThread::OnClean() {
   DVLOG(1) << "GPU: Removing all contexts";
   if (gpu_channel_manager())