aura: Fix WidgetFocusChangeListener::OnNativeFocusChange().

ui/views/widget/native_widget_aura.h

Index: ui/views/widget/native_widget_aura.h
diff --git a/ui/views/widget/native_widget_aura.h b/ui/views/widget/native_widget_aura.h
index 57dbe271882576986efd838f07cd5aea17837d6c..f4c177f08a41ea64bab6c125bf2de7447080a3f6 100644
--- a/ui/views/widget/native_widget_aura.h
+++ b/ui/views/widget/native_widget_aura.h
@@ -131,7 +131,7 @@ class VIEWS_EXPORT NativeWidgetAura : public internal::NativeWidgetPrivate,
   virtual gfx::Size GetMinimumSize() const OVERRIDE;
   virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
                                const gfx::Rect& new_bounds) OVERRIDE;
-  virtual void OnFocus() OVERRIDE;
+  virtual void OnFocus(aura::Window* old_focused_window) OVERRIDE;
   virtual void OnBlur() OVERRIDE;
   virtual bool OnKeyEvent(aura::KeyEvent* event) OVERRIDE;
   virtual gfx::NativeCursor GetCursor(const gfx::Point& point) OVERRIDE;
@@ -189,6 +189,9 @@ class VIEWS_EXPORT NativeWidgetAura : public internal::NativeWidgetPrivate,
   // Can we be made active?
   bool can_activate_;
 
+  // Are we in the destructor?
+  bool destroying_;
+
   gfx::NativeCursor cursor_;
 
   // The saved window state for exiting full screen state.