mash: Port mojo:ash_sysui's ContextMenuMus to mojo:ash.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 525856655d0aa23c7ac639e4998b240b5e47d42b..ff922c784346645c75545ccc14e05354fcf865f1 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -15,7 +15,7 @@
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/default_system_tray_delegate.h"
 #include "ash/common/wm/window_state.h"
-#include "ash/default_user_wallpaper_delegate.h"
+#include "ash/default_wallpaper_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell/context_menu.h"
 #include "ash/shell/example_factory.h"
@@ -236,8 +236,8 @@ ash::SystemTrayDelegate* ShellDelegateImpl::CreateSystemTrayDelegate() {
   return new DefaultSystemTrayDelegate;
 }
 
-ash::UserWallpaperDelegate* ShellDelegateImpl::CreateUserWallpaperDelegate() {
-  return new DefaultUserWallpaperDelegate();
+ash::WallpaperDelegate* ShellDelegateImpl::CreateWallpaperDelegate() {
+  return new DefaultWallpaperDelegate();
 }
 
 ash::SessionStateDelegate* ShellDelegateImpl::CreateSessionStateDelegate() {