Manual fixups in compositor code scoped_refptr operator T* removal.

cc/base/unique_notifier.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_BASE_UNIQUE_NOTIFIER_H_
 #define CC_BASE_UNIQUE_NOTIFIER_H_
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 14 matching lines @@
   // happen from this class.
   ~UniqueNotifier();
 
   // Schedule a notification to be run. If another notification is already
   // pending, then only one notification will take place.
   void Schedule();
 
  private:
   void Notify();
 
+  // TODO(dcheng): How come this doesn't need to hold a ref to the task runner?
   base::SequencedTaskRunner* task_runner_;
   base::Closure closure_;
   bool notification_pending_;
 
   base::WeakPtrFactory<UniqueNotifier> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_UNIQUE_NOTIFIER_H_