[Extensions] Convert APIs to use movable types [10]

extensions/browser/api/audio/audio_service.h

 // Copyright (c) 2013 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 EXTENSIONS_BROWSER_API_AUDIO_AUDIO_SERVICE_H_
 #define EXTENSIONS_BROWSER_API_AUDIO_AUDIO_SERVICE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "extensions/common/api/audio.h"
 
 namespace extensions {
 
-using OutputInfo = std::vector<linked_ptr<api::audio::OutputDeviceInfo>>;
-using InputInfo = std::vector<linked_ptr<api::audio::InputDeviceInfo>>;
+using OutputInfo = std::vector<api::audio::OutputDeviceInfo>;
+using InputInfo = std::vector<api::audio::InputDeviceInfo>;
 using DeviceIdList = std::vector<std::string>;
-using DeviceInfoList = std::vector<linked_ptr<api::audio::AudioDeviceInfo>>;
+using DeviceInfoList = std::vector<api::audio::AudioDeviceInfo>;
 
 class AudioService {
  public:
   class Observer {
    public:
     // Called when anything changes to the audio device configuration.
     virtual void OnDeviceChanged() = 0;
 
     // Called when the sound level of an active audio device changes.
     virtual void OnLevelChanged(const std::string& id, int level) = 0;
 
     // Called when the mute state of audio input/output changes.
     virtual void OnMuteChanged(bool is_input, bool is_muted) = 0;
 
     // Called when the audio devices change, either new devices being added, or
     // existing devices being removed.
     virtual void OnDevicesChanged(const DeviceInfoList&) = 0;
 
    protected:
     virtual ~Observer() {}
   };
 
-  // Callback type for completing to get audio device information.
-  typedef base::Callback<void(const OutputInfo&, const InputInfo&, bool)>
-      GetInfoCallback;
-
   // Creates a platform-specific AudioService instance.
   static AudioService* CreateInstance();
 
   virtual ~AudioService() {}
 
   // Called by listeners to this service to add/remove themselves as observers.
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
 
   // Start to query audio device information. Should be called on UI thread.
-  // The |callback| will be invoked once the query is completed.
-  virtual void StartGetInfo(const GetInfoCallback& callback) = 0;
+  // Populates |output_info_out| and |input_info_out| with the results.
+  // Returns true on success.
+  virtual bool GetInfo(OutputInfo* output_info_out,
+                       InputInfo* input_info_out) = 0;
 
   // Sets the active devices to the devices specified by |device_list|.
   // It can pass in the "complete" active device list of either input
   // devices, or output devices, or both. If only input devices are passed in,
   // it will only change the input devices' active status, output devices will
   // NOT be changed; similarly for the case if only output devices are passed.
   // If the devices specified in |new_active_ids| are already active, they will
   // remain active. Otherwise, the old active devices will be de-activated
   // before we activate the new devices with the same type(input/output).
   virtual void SetActiveDevices(const DeviceIdList& device_list) = 0;
 
   // Set the muted and volume/gain properties of a device.
   virtual bool SetDeviceProperties(const std::string& device_id,
                                    bool muted,
                                    int volume,
                                    int gain) = 0;
 
  protected:
   AudioService() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioService);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_AUDIO_AUDIO_SERVICE_H_