First step towards moving AudioDevice from content/ to media/audio.

content/browser/renderer_host/media/audio_input_device_manager_unittest.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 <string>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 441 matching lines @@
               Opened(content::MEDIA_STREAM_DEVICE_TYPE_AUDIO_CAPTURE,
                      session_id))
       .Times(1);
   message_loop_->RunAllPending();
 
   // Starts a non-opened device.
   // This should fail and trigger error code 'kDeviceNotAvailable'.
   int invalid_session_id = session_id + 1;
   manager_->Start(invalid_session_id, audio_input_event_handler.get());
   EXPECT_CALL(*audio_input_event_handler,
-              DeviceStarted(invalid_session_id,
-                            AudioInputDeviceManager::kInvalidDeviceId))
+              DeviceStarted(invalid_session_id, std::string()))
       .Times(1);
   message_loop_->RunAllPending();
 
   manager_->Close(session_id);
   EXPECT_CALL(*audio_input_listener_,
               Closed(content::MEDIA_STREAM_DEVICE_TYPE_AUDIO_CAPTURE,
                      session_id))
       .Times(1);
   message_loop_->RunAllPending();
 }
@@ skipping 24 matching lines @@
   manager_->Start(session_id, audio_input_event_handler.get());
   EXPECT_CALL(*audio_input_event_handler,
               DeviceStarted(session_id,
                             media::AudioManagerBase::kDefaultDeviceId))
       .Times(1);
   message_loop_->RunAllPending();
 
   // Starts the session for the second time, it should fail.
   manager_->Start(session_id, audio_input_event_handler.get());
   EXPECT_CALL(*audio_input_event_handler,
-              DeviceStarted(session_id,
-                            AudioInputDeviceManager::kInvalidDeviceId))
+              DeviceStarted(session_id, std::string()))
       .Times(1);
 
   manager_->Stop(session_id);
   manager_->Close(session_id);
   EXPECT_CALL(*audio_input_listener_,
               Closed(content::MEDIA_STREAM_DEVICE_TYPE_AUDIO_CAPTURE,
                      session_id))
       .Times(1);
   message_loop_->RunAllPending();
 }
 
 }  // namespace media_stream