[Refactor] Introduce MediaDelegate

ash/test/test_shell_delegate.h

Index: ash/test/test_shell_delegate.h
diff --git a/ash/test/test_shell_delegate.h b/ash/test/test_shell_delegate.h
index 98ffca41db494e08ea1523fd5429393e2d9aed94..dfed705abb06022e6afb3eb587e4cff2fd143f20 100644
--- a/ash/test/test_shell_delegate.h
+++ b/ash/test/test_shell_delegate.h
@@ -49,11 +49,9 @@ class TestShellDelegate : public ShellDelegate {
   virtual SessionStateDelegate* CreateSessionStateDelegate() OVERRIDE;
   virtual AccessibilityDelegate* CreateAccessibilityDelegate() OVERRIDE;
   virtual NewWindowDelegate* CreateNewWindowDelegate() OVERRIDE;
+  virtual MediaDelegate* CreateMediaDelegate() OVERRIDE;
   virtual aura::client::UserActionClient* CreateUserActionClient() OVERRIDE;
   virtual void RecordUserMetricsAction(UserMetricsAction action) OVERRIDE;
-  virtual void HandleMediaNextTrack() OVERRIDE;
-  virtual void HandleMediaPlayPause() OVERRIDE;
-  virtual void HandleMediaPrevTrack() OVERRIDE;
   virtual ui::MenuModel* CreateContextMenu(aura::Window* root) OVERRIDE;
   virtual RootWindowHostFactory* CreateRootWindowHostFactory() OVERRIDE;
   virtual base::string16 GetProductName() const OVERRIDE;