[Refactor] Introduce MediaDelegate

ash/accelerators/accelerator_controller.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 "ash/accelerators/accelerator_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <iostream>
 #include <string>
 
 #include "ash/accelerators/accelerator_commands.h"
 #include "ash/accelerators/accelerator_table.h"
 #include "ash/accelerators/debug_commands.h"
 #include "ash/ash_switches.h"
 #include "ash/caps_lock_delegate.h"
 #include "ash/debug.h"
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/focus_cycler.h"
 #include "ash/ime_control_delegate.h"
 #include "ash/launcher/launcher.h"
 #include "ash/launcher/launcher_delegate.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/magnifier/magnification_controller.h"
 #include "ash/magnifier/partial_magnification_controller.h"
+#include "ash/media_delegate.h"
 #include "ash/multi_profile_uma.h"
 #include "ash/new_window_delegate.h"
 #include "ash/root_window_controller.h"
 #include "ash/rotator/screen_rotation.h"
 #include "ash/screenshot_delegate.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
@@ skipping 269 matching lines @@
              partial_magnification_controller()->is_enabled()) {
     float scale = delta_index > 0 ? kDefaultPartialMagnifiedScale : 1;
     ash::Shell::GetInstance()->partial_magnification_controller()->
         SetScale(scale);
   }
 
   return true;
 }
 
 bool HandleMediaNextTrack() {
-  Shell::GetInstance()->delegate()->HandleMediaNextTrack();
+  Shell::GetInstance()->media_delegate()->HandleMediaNextTrack();
   return true;
 }
 
 bool HandleMediaPlayPause() {
-  Shell::GetInstance()->delegate()->HandleMediaPlayPause();
+  Shell::GetInstance()->media_delegate()->HandleMediaPlayPause();
   return true;
 }
 
 bool HandleMediaPrevTrack() {
-  Shell::GetInstance()->delegate()->HandleMediaPrevTrack();
+  Shell::GetInstance()->media_delegate()->HandleMediaPrevTrack();
   return true;
 }
 
 bool HandlePrintLayerHierarchy() {
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   for (size_t i = 0; i < root_windows.size(); ++i) {
     ui::PrintLayerHierarchy(root_windows[i]->layer(),
                             root_windows[i]->GetLastMouseLocationInRoot());
   }
   return true;
@@ skipping 646 matching lines @@
     keyboard_brightness_control_delegate) {
   keyboard_brightness_control_delegate_ =
       keyboard_brightness_control_delegate.Pass();
 }
 
 bool AcceleratorController::CanHandleAccelerators() const {
   return true;
 }
 
 }  // namespace ash