Move gpu memory calculations to Compositor.

cc/output/context_provider.h

Index: cc/output/context_provider.h
diff --git a/cc/output/context_provider.h b/cc/output/context_provider.h
index c024e02328e9a3930b7593e54b986bdff3566ae5..7c972464bcef2044945bde02bf47b6cd66dd0f8b 100644
--- a/cc/output/context_provider.h
+++ b/cc/output/context_provider.h
@@ -100,13 +100,6 @@ class ContextProvider : public base::RefCountedThreadSafe<ContextProvider> {
   virtual void SetLostContextCallback(
       const LostContextCallback& lost_context_callback) = 0;
 
-  // Sets a callback to be called when the memory policy changes. This should be
-  // called from the same thread that the context is bound to.
-  typedef base::Callback<void(const ManagedMemoryPolicy& policy)>
-      MemoryPolicyChangedCallback;
-  virtual void SetMemoryPolicyChangedCallback(
-      const MemoryPolicyChangedCallback& memory_policy_changed_callback) = 0;
-
  protected:
   friend class base::RefCountedThreadSafe<ContextProvider>;
   virtual ~ContextProvider() {}