Remove MessageLoop methods from Filter interface

media/base/message_loop_factory_impl.cc

+// 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.
+
+#include "media/base/message_loop_factory_impl.h"
+
+namespace media {
+
+MessageLoopFactoryImpl::MessageLoopFactoryImpl() {}
+
+MessageLoopFactoryImpl::~MessageLoopFactoryImpl() {
+  AutoLock auto_lock(lock_);
+
+  for (ThreadMap::iterator iter = thread_map_.begin();
+       iter != thread_map_.end();
+       ++iter) {
+    base::Thread* thread = (*iter).second;
+
+    if (thread) {
+      thread->Stop();
+      delete thread;
+    }
+  }
+  thread_map_.clear();
+}
+
+// MessageLoopFactory methods.
+MessageLoop* MessageLoopFactoryImpl::GetMessageLoop(const std::string& name) {
+  if (name.empty()) {
+    return NULL;
+  }
+
+  AutoLock auto_lock(lock_);
+
+  ThreadMap::iterator it = thread_map_.find(name);
+  if (it != thread_map_.end())
+    return (*it).second->message_loop();
+
+  scoped_ptr<base::Thread> thread(new base::Thread(name.c_str()));
+
+  if (thread->Start()) {
+    MessageLoop* message_loop = thread->message_loop();
+    thread_map_[name] = thread.release();
+    return message_loop;
+  }
+
+  LOG(ERROR) << "Failed to start '" << name << "' thread!";
+  return NULL;
+}
+
+}  // namespace media