gpu: Use GpuMemoryBufferManager from GpuService when possible.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index fecc962a4097ce95c0e0b8cba14999138c933fd9..12451be5b4e9e1b804ebca26ccfb83288dd6f138 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1609,7 +1609,11 @@ RenderThreadImpl::GetCompositorImplThreadTaskRunner() {
 }
 
 gpu::GpuMemoryBufferManager* RenderThreadImpl::GetGpuMemoryBufferManager() {
-  return gpu_memory_buffer_manager();
+#if defined(USE_AURA)
+  if (gpu_service_)
+    return gpu_service_->gpu_memory_buffer_manager();
+#endif
+  return  gpu_memory_buffer_manager();
 }
 
 blink::scheduler::RendererScheduler* RenderThreadImpl::GetRendererScheduler() {