Use mojo volume interfaces for mash and classic ash.

ash/common/system/tray/system_tray_delegate.h

 // 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.
 
 #ifndef ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/common/login_status.h"
-#include "ash/common/system/volume_control_delegate.h"
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
 #include "base/i18n/time_formatting.h"
 #include "base/strings/string16.h"
 #include "ui/gfx/image/image_skia.h"
 
 class AccountId;
 
 namespace base {
 class TimeDelta;
@@ skipping 69 matching lines @@
 class NetworkingConfigDelegate;
 class VPNDelegate;
 
 using RebootOnShutdownCallback = base::Callback<void(bool)>;
 
 // SystemTrayDelegate is intended for delegating tasks in the System Tray to the
 // application (e.g. Chrome). These tasks should be limited to application
 // (browser) specific tasks. For non application specific tasks, where possible,
 // components/, chromeos/, device/, etc., code should be used directly. If more
 // than one related method is being added, consider adding an additional
-// specific delegate (e.g. VolumeControlDelegate).
+// specific delegate (e.g. VPNDelegate).
 //
 // These methods should all have trivial default implementations for platforms
 // that do not implement the method (e.g. return false or nullptr). This
 // eliminates the need to propagate default implementations across the various
 // implementations of this class. Consumers of this delegate should handle the
 // default return value (e.g. nullptr).
 class ASH_EXPORT SystemTrayDelegate {
  public:
   SystemTrayDelegate();
   virtual ~SystemTrayDelegate();
@@ skipping 101 matching lines @@
 
   // Returns whether the delegate has initiated a bluetooth discovery session.
   virtual bool GetBluetoothDiscovering();
 
   // Returns CastConfigDelegate. May return nullptr.
   virtual CastConfigDelegate* GetCastConfigDelegate();
 
   // Returns NetworkingConfigDelegate. May return nullptr.
   virtual NetworkingConfigDelegate* GetNetworkingConfigDelegate() const;
 
-  // Returns VolumeControlDelegate. May return nullptr.
-  virtual VolumeControlDelegate* GetVolumeControlDelegate() const;
-
-  // Sets the VolumeControlDelegate.
-  virtual void SetVolumeControlDelegate(
-      std::unique_ptr<VolumeControlDelegate> delegate);
-
   // Retrieves the session start time. Returns |false| if the time is not set.
   virtual bool GetSessionStartTime(base::TimeTicks* session_start_time);
 
   // Retrieves the session length limit. Returns |false| if no limit is set.
   virtual bool GetSessionLengthLimit(base::TimeDelta* session_length_limit);
 
   // Get the system tray menu size in pixels (dependent on the language).
   virtual int GetSystemTrayMenuWidth();
 
   // The active user has been changed. This will be called when the UI is ready
@@ skipping 29 matching lines @@
   // Creates a system tray item for display rotation lock.
   // TODO(jamescook): Remove this when mus has support for display management
   // and we have a DisplayManager equivalent. See http://crbug.com/548429
   virtual std::unique_ptr<SystemTrayItem> CreateRotationLockTrayItem(
       SystemTray* tray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_