Remove MessageLoop methods from Filter interface

media/base/message_loop_factory.h

+// Copyright (c) 2011 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 MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_
+#define MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_
+
+#include <string>
+
+#include "base/scoped_ptr.h"
+
+class MessageLoop;
+
+namespace media {
+
+// Factory object that manages named MessageLoops.
+class MessageLoopFactory {
+ public:
+  // Get the message loop associated with |name|. A new MessageLoop
+  // is created if the factory doesn't have one associated with |name|.
+  // NULL is returned if |name| is an empty string, or a new
+  // MessageLoop needs to be created and a failure occurs during the
+  // creation process.
+  virtual MessageLoop* GetMessageLoop(const std::string& name) = 0;
+
+ protected:
+  // Only allow scoped_ptr<> to delete factory.
+  friend class scoped_ptr<MessageLoopFactory>;
+  virtual ~MessageLoopFactory();
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_