Revert of Move gpu memory calculations to Compositor.

content/common/gpu/gpu_memory_manager.h

Index: content/common/gpu/gpu_memory_manager.h
diff --git a/content/common/gpu/gpu_memory_manager.h b/content/common/gpu/gpu_memory_manager.h
index cdfd30da970df5a7bd5b9bf79fa7d8f427480c8e..850a293de5a4652cedb6a7fe9fa5391b8f5b722c 100644
--- a/content/common/gpu/gpu_memory_manager.h
+++ b/content/common/gpu/gpu_memory_manager.h
@@ -112,6 +112,12 @@ class CONTENT_EXPORT GpuMemoryManager :
 
   void Manage();
   void SetClientsHibernatedState() const;
+  void AssignSurfacesAllocations();
+  void AssignNonSurfacesAllocations();
+
+  // Update the amount of GPU memory we think we have in the system, based
+  // on what the stubs' contexts report.
+  void UpdateAvailableGpuMemory();
 
   // Send memory usage stats to the browser process.
   void SendUmaStatsToBrowser();