Speculative fix for sticky keys overlay crash.

ash/sticky_keys/sticky_keys_overlay.h

Index: ash/sticky_keys/sticky_keys_overlay.h
diff --git a/ash/sticky_keys/sticky_keys_overlay.h b/ash/sticky_keys/sticky_keys_overlay.h
index 63917941a4c4bfe872d9b88ca35efa0bc5f69513..a257b0d215307cbecebb160a1f769a8b5b87f4e0 100644
--- a/ash/sticky_keys/sticky_keys_overlay.h
+++ b/ash/sticky_keys/sticky_keys_overlay.h
@@ -61,9 +61,10 @@ class ASH_EXPORT StickyKeysOverlay : public ui::LayerAnimationObserver {
   void OnLayerAnimationScheduled(ui::LayerAnimationSequence* sequence) override;
 
   bool is_visible_;
+  // Note: keep the order the same. |overlay_view_| must outlive
+  // |overlay_widget_|.
+  scoped_ptr<StickyKeysOverlayView> overlay_view_;
   scoped_ptr<views::Widget> overlay_widget_;
-  // Ownership of |overlay_view_| is passed to the view heirarchy.
-  StickyKeysOverlayView* overlay_view_;
   gfx::Size widget_size_;
 };