Make NativeViewHostAura clipping window non-focusable.

ui/views/controls/native/native_view_host_aura.h

Index: ui/views/controls/native/native_view_host_aura.h
diff --git a/ui/views/controls/native/native_view_host_aura.h b/ui/views/controls/native/native_view_host_aura.h
index 3d32374d0350a7a99deafc702af01aac90665734..05c03d578b0c4ad9860db383a795ea10bf312ca9 100644
--- a/ui/views/controls/native/native_view_host_aura.h
+++ b/ui/views/controls/native/native_view_host_aura.h
@@ -40,7 +40,10 @@ class VIEWS_EXPORT NativeViewHostAura : public NativeViewHostWrapper,
  private:
   friend class NativeViewHostAuraTest;
 
+  class ClippingWindowDelegate;
+
   // Overridden from aura::WindowObserver:
+  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
 
   // Reparents the native view with the clipping window existing between it and
@@ -54,6 +57,8 @@ class VIEWS_EXPORT NativeViewHostAura : public NativeViewHostWrapper,
   // Our associated NativeViewHost.
   NativeViewHost* host_;
 
+  scoped_ptr<ClippingWindowDelegate> clipping_window_delegate_;
+
   // Window that exists between the native view and the parent that allows for
   // clipping to occur. This is positioned in the coordinate space of
   // host_->GetWidget().