Move gpu memory calculations to Compositor.

blimp/client/compositor/blimp_context_provider.cc

Index: blimp/client/compositor/blimp_context_provider.cc
diff --git a/blimp/client/compositor/blimp_context_provider.cc b/blimp/client/compositor/blimp_context_provider.cc
index 8d338847a70202bb6bc7b0a2e333976fee8a3773..213655ea0d88fab4da142dc80c0648f74df5d689 100644
--- a/blimp/client/compositor/blimp_context_provider.cc
+++ b/blimp/client/compositor/blimp_context_provider.cc
@@ -163,12 +163,6 @@ void BlimpContextProvider::SetLostContextCallback(
   lost_context_callback_ = lost_context_callback;
 }
 
-void BlimpContextProvider::SetMemoryPolicyChangedCallback(
-    const MemoryPolicyChangedCallback& memory_policy_changed_callback) {
-  // There's no memory manager for the in-process implementation.
-  // TODO(dtrainor): Figure out if we need a memory manager for Blimp.
-}
-
 void BlimpContextProvider::OnLostContext() {
   DCHECK(context_thread_checker_.CalledOnValidThread());