mash: Change the MediaDelegate to a Media{Controller,Client}.

ash/common/accelerators/accelerator_controller.cc

Index: ash/common/accelerators/accelerator_controller.cc
diff --git a/ash/common/accelerators/accelerator_controller.cc b/ash/common/accelerators/accelerator_controller.cc
index d3993c22b64df7c6970912999f70aadbdd8f0f58..db032bb3a8cafe407d68f3628775a7d7165a25af 100644
--- a/ash/common/accelerators/accelerator_controller.cc
+++ b/ash/common/accelerators/accelerator_controller.cc
@@ -13,7 +13,7 @@
 #include "ash/common/accessibility_types.h"
 #include "ash/common/focus_cycler.h"
 #include "ash/common/ime_control_delegate.h"
-#include "ash/common/media_delegate.h"
+#include "ash/common/media_controller.h"
 #include "ash/common/multi_profile_uma.h"
 #include "ash/common/new_window_controller.h"
 #include "ash/common/session/session_state_delegate.h"
@@ -133,15 +133,15 @@ void HandleLaunchLastApp() {
 }
 
 void HandleMediaNextTrack() {
-  WmShell::Get()->media_delegate()->HandleMediaNextTrack();
+  WmShell::Get()->media_controller()->HandleMediaNextTrack();
 }
 
 void HandleMediaPlayPause() {
-  WmShell::Get()->media_delegate()->HandleMediaPlayPause();
+  WmShell::Get()->media_controller()->HandleMediaPlayPause();
 }
 
 void HandleMediaPrevTrack() {
-  WmShell::Get()->media_delegate()->HandleMediaPrevTrack();
+  WmShell::Get()->media_controller()->HandleMediaPrevTrack();
 }
 
 bool CanHandleNewIncognitoWindow() {