Use mojo volume interfaces for mash and classic ash.

ash/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 assert(use_aura)
@@ skipping 405 matching lines @@
     "common/system/user/rounded_image_view.h",
     "common/system/user/tray_user.cc",
     "common/system/user/tray_user.h",
     "common/system/user/tray_user_separator.cc",
     "common/system/user/tray_user_separator.h",
     "common/system/user/user_card_view.cc",
     "common/system/user/user_card_view.h",
     "common/system/user/user_observer.h",
     "common/system/user/user_view.cc",
     "common/system/user/user_view.h",
-    "common/system/volume_control_delegate.h",
     "common/system/web_notification/ash_popup_alignment_delegate.cc",
     "common/system/web_notification/ash_popup_alignment_delegate.h",
     "common/system/web_notification/web_notification_tray.cc",
     "common/system/web_notification/web_notification_tray.h",
     "common/wallpaper/wallpaper_controller.cc",
     "common/wallpaper/wallpaper_controller.h",
     "common/wallpaper/wallpaper_controller_observer.h",
     "common/wallpaper/wallpaper_delegate.h",
     "common/wallpaper/wallpaper_view.cc",
     "common/wallpaper/wallpaper_view.h",
@@ skipping 1036 matching lines @@
   if (is_win) {
     configs -= [ "//build/config/win:console" ]
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }