Make AudioDebugFileWriter create its own file worker thread.

media/audio/test_audio_input_controller_factory.cc

 // Copyright (c) 2012 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/audio/test_audio_input_controller_factory.h"
 #include "media/audio/audio_io.h"
 
 namespace media {
 
 TestAudioInputController::TestAudioInputController(
     TestAudioInputControllerFactory* factory,
     AudioManager* audio_manager,
     const AudioParameters& audio_parameters,
     EventHandler* event_handler,
     SyncWriter* sync_writer,
     UserInputMonitor* user_input_monitor,
     StreamType type)
     : AudioInputController(audio_manager->GetTaskRunner(),
                            event_handler,
                            sync_writer,
                            user_input_monitor,
                            audio_parameters,
-                           type,
-                           audio_manager->GetTaskRunner()),
+                           type),
       audio_parameters_(audio_parameters),
       factory_(factory),
       event_handler_(event_handler),
       sync_writer_(sync_writer) {}
 
 TestAudioInputController::~TestAudioInputController() {
   // Inform the factory so that it allows creating new instances in future.
   factory_->OnTestAudioInputControllerDestroyed(this);
 }
 
@@ skipping 32 matching lines @@
   return controller_;
 }
 
 void TestAudioInputControllerFactory::OnTestAudioInputControllerDestroyed(
     TestAudioInputController* controller) {
   DCHECK_EQ(controller_, controller);
   controller_ = NULL;
 }
 
 }  // namespace media