[Refactor] Introduce MediaDelegate

chrome/browser/ui/ash/chrome_shell_delegate_views.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate_views.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate_views.cc b/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
index ccfe795e5bb83b11e2bfe07fdae2783dbb40fa7c..d22eedc462bf36d58f1adbea4814f94700b0a649 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
@@ -6,6 +6,7 @@
 
 #include "ash/accessibility_delegate.h"
 #include "ash/magnifier/magnifier_constants.h"
+#include "ash/media_delegate.h"
 #include "ash/system/tray/default_system_tray_delegate.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
@@ -47,6 +48,18 @@ class NewWindowDelegateImpl : public ChromeNewWindowDelegate {
   DISALLOW_COPY_AND_ASSIGN(NewWindowDelegateImpl);
 };
 
+class MediaDelegateImpl : public ash::MediaDelegate {
+ public:
+  MediaDelegateImpl() {}
+  virtual ~MediaDelegateImpl() {}
+  virtual void HandleMediaNextTrack() OVERRIDE {}
+  virtual void HandleMediaPlayPause() OVERRIDE {}
+  virtual void HandleMediaPrevTrack() OVERRIDE {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MediaDelegateImpl);
+};
+
 class EmptyAccessibilityDelegate : public ash::AccessibilityDelegate {
  public:
   EmptyAccessibilityDelegate() {}
@@ -129,6 +142,10 @@ ash::NewWindowDelegate* ChromeShellDelegate::CreateNewWindowDelegate() {
   return new NewWindowDelegateImpl;
 }
 
+ash::MediaDelegate* ChromeShellDelegate::CreateMediaDelegate() {
+  return new MediaDelegateImpl;
+}
+
 ash::CapsLockDelegate* ChromeShellDelegate::CreateCapsLockDelegate() {
   return new CapsLockDelegate();
 }
@@ -157,15 +174,6 @@ ash::UserWallpaperDelegate* ChromeShellDelegate::CreateUserWallpaperDelegate() {
 #endif
 }
 
-void ChromeShellDelegate::HandleMediaNextTrack() {
-}
-
-void ChromeShellDelegate::HandleMediaPlayPause() {
-}
-
-void ChromeShellDelegate::HandleMediaPrevTrack() {
-}
-
 void ChromeShellDelegate::Observe(int type,
                                   const content::NotificationSource& source,
                                   const content::NotificationDetails& details) {