Update Ash CustomFrame to not directly access Shell

chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc

Index: chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc
diff --git a/chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc b/chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc
index 2a69c9d559d4721054825b77c86ca942cfcbc13d..205a84604d2089941173129309351e654ec52386 100644
--- a/chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc
+++ b/chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.cc
@@ -273,6 +273,9 @@ ChromeNativeAppWindowViewsAuraAsh::CreateNonClientFrameView(
     return frame_view;
   }
 
+  if (chrome::IsRunningInMash())
+    return ChromeNativeAppWindowViews::CreateNonClientFrameView(widget);
+
   ash::CustomFrameViewAsh* custom_frame_view =
       new ash::CustomFrameViewAsh(widget);
   // Non-frameless app windows can be put into immersive fullscreen.