Move gpu memory calculations to Compositor.

cc/output/output_surface.cc

Index: cc/output/output_surface.cc
diff --git a/cc/output/output_surface.cc b/cc/output/output_surface.cc
index efa6d13b8d720dda4dd77f1f99c1091bb063c5ff..93b6cdd55d35807c4dd38f64b573a87aca0026d2 100644
--- a/cc/output/output_surface.cc
+++ b/cc/output/output_surface.cc
@@ -210,8 +210,6 @@ bool OutputSurface::BindToClient(OutputSurfaceClient* client) {
     if (success) {
       context_provider_->SetLostContextCallback(base::Bind(
           &OutputSurface::DidLoseOutputSurface, base::Unretained(this)));
-      context_provider_->SetMemoryPolicyChangedCallback(
-          base::Bind(&OutputSurface::SetMemoryPolicy, base::Unretained(this)));
     }
   }
 
@@ -355,8 +353,6 @@ void OutputSurface::DetachFromClientInternal() {
   if (context_provider_.get()) {
     context_provider_->SetLostContextCallback(
         ContextProvider::LostContextCallback());
-    context_provider_->SetMemoryPolicyChangedCallback(
-        ContextProvider::MemoryPolicyChangedCallback());
   }
   context_provider_ = nullptr;
   client_ = nullptr;