Fixes crash introduced by fix for 11229. The fix for 11229 made it so

views/widget/widget.h

Index: views/widget/widget.h
diff --git a/views/widget/widget.h b/views/widget/widget.h
index e71f1bacd09c4e217cf53d1ef53ffb7842e76371..883d86c00cb6c759e3968dd37ebb603768c08619 100644
--- a/views/widget/widget.h
+++ b/views/widget/widget.h
@@ -482,7 +482,8 @@ class Widget : public internal::NativeWidgetDelegate,
         const_cast<const Widget*>(this)->client_view());
   }
   const ClientView* client_view() const {
-    return non_client_view()->client_view();
+    // non_client_view_ may be NULL, especially during creation.
+    return non_client_view_ ? non_client_view_->client_view() : NULL;
   }
 
 #if defined(UNIT_TEST)