Remove task.h and finish base::Bind() migration.

media/audio/audio_output_controller_unittest.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 "base/bind.h"
 #include "base/environment.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
-#include "base/task.h"
 #include "base/synchronization/waitable_event.h"
 #include "media/audio/audio_output_controller.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
 using ::testing::AtLeast;
 using ::testing::DoAll;
 using ::testing::Exactly;
 using ::testing::InvokeWithoutArgs;
@@ skipping 405 matching lines @@
   controller->Close(base::Bind(&SignalClosedEvent, &closed_event_1));
 
   base::WaitableEvent closed_event_2(true, false);
   controller->Close(base::Bind(&SignalClosedEvent, &closed_event_2));
 
   closed_event_1.Wait();
   closed_event_2.Wait();
 }
 
 }  // namespace media