Always use arc::InstanceHolder<T>::GetInstanceForMethod

chrome/browser/chromeos/arc/arc_wallpaper_service.cc

Index: chrome/browser/chromeos/arc/arc_wallpaper_service.cc
diff --git a/chrome/browser/chromeos/arc/arc_wallpaper_service.cc b/chrome/browser/chromeos/arc/arc_wallpaper_service.cc
index bbd169e494aa1810d259a1012d1e6254f98984b9..722e0fd3c3b5b58abe4918fe4a84e1118b95b9d8 100644
--- a/chrome/browser/chromeos/arc/arc_wallpaper_service.cc
+++ b/chrome/browser/chromeos/arc/arc_wallpaper_service.cc
@@ -96,12 +96,9 @@ ArcWallpaperService::~ArcWallpaperService() {
 void ArcWallpaperService::OnInstanceReady() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   mojom::WallpaperInstance* wallpaper_instance =
-      arc_bridge_service()->wallpaper()->instance();
-  if (!wallpaper_instance) {
-    LOG(DFATAL) << "OnWallpaperInstanceReady called, "
-                << "but no wallpaper instance found";
+      arc_bridge_service()->wallpaper()->GetInstanceForMethod("Init");
+  if (!wallpaper_instance)
     return;
-  }
   wallpaper_instance->Init(binding_.CreateInterfacePtrAndBind());
   ash::WmShell::Get()->wallpaper_controller()->AddObserver(this);
 }