Cleanup mojo Wallpaper interfaces for mash.

components/arc/intent_helper/arc_intent_helper_bridge.cc

Index: components/arc/intent_helper/arc_intent_helper_bridge.cc
diff --git a/components/arc/intent_helper/arc_intent_helper_bridge.cc b/components/arc/intent_helper/arc_intent_helper_bridge.cc
index e7af4fa08f7faf256aff3dc1616b46bea0f8d871..e375dea56f271ed69c031ddad5e9d6a69acb691a 100644
--- a/components/arc/intent_helper/arc_intent_helper_bridge.cc
+++ b/components/arc/intent_helper/arc_intent_helper_bridge.cc
@@ -9,7 +9,7 @@
 
 #include "ash/common/new_window_delegate.h"
 #include "ash/common/shell_delegate.h"
-#include "ash/common/wallpaper/wallpaper_delegate.h"
+#include "ash/common/wallpaper/wallpaper_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
@@ -82,7 +82,7 @@ void ArcIntentHelperBridge::OnOpenUrl(const mojo::String& url) {
 
 void ArcIntentHelperBridge::OpenWallpaperPicker() {
   DCHECK(thread_checker_.CalledOnValidThread());
-  ash::WmShell::Get()->wallpaper_delegate()->OpenSetWallpaperPage();
+  ash::WmShell::Get()->wallpaper_controller()->OpenSetWallpaperPage();
 }
 
 void ArcIntentHelperBridge::SetWallpaperDeprecated(