Cleanup mojo Wallpaper interfaces for mash.

chrome/browser/ui/webui/settings/appearance_handler.cc

Index: chrome/browser/ui/webui/settings/appearance_handler.cc
diff --git a/chrome/browser/ui/webui/settings/appearance_handler.cc b/chrome/browser/ui/webui/settings/appearance_handler.cc
index 79ae0fd49b7895ae5789cd64845574e2eb5b6716..7cdd91d2aea310abc635c1db8078859ae4679e3f 100644
--- a/chrome/browser/ui/webui/settings/appearance_handler.cc
+++ b/chrome/browser/ui/webui/settings/appearance_handler.cc
@@ -15,8 +15,7 @@
 #include "content/public/browser/web_ui.h"
 
 #if defined(OS_CHROMEOS)
-#include "ash/common/wallpaper/wallpaper_delegate.h"  // nogncheck
-#include "ash/common/wm_shell.h"  // nogncheck
+#include "chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h"
 #endif
 
 namespace settings {
@@ -87,7 +86,7 @@ void AppearanceHandler::HandleGetResetThemeEnabled(
 #if defined(OS_CHROMEOS)
 void AppearanceHandler::HandleOpenWallpaperManager(
     const base::ListValue* /*args*/) {
-  ash::WmShell::Get()->wallpaper_delegate()->OpenSetWallpaperPage();
+  chromeos::WallpaperManager::Get()->Open();
 }
 #endif