Destroy tooltip manager if the native window is destroyed.

views/widget/tooltip_manager_views.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VIEWS_WIDGET_TOOLTIP_MANAGER_VIEWS_H_
 #define VIEWS_WIDGET_TOOLTIP_MANAGER_VIEWS_H_
 #pragma once
 
 #include "base/message_loop.h"
 #include "base/timer.h"
 #include "views/controls/label.h"
 #include "views/widget/native_widget.h"
 #include "views/widget/tooltip_manager.h"
 #include "views/widget/widget_delegate.h"
 #include "views/view.h"
 
 #if defined(USE_X11)
 typedef union _XEvent XEvent;
 namespace ui {
 union WaylandEvent;
 }
 #endif
 
 namespace views {
 
 class Widget;
 
 // TooltipManager implementation for Views.
 class TooltipManagerViews : public TooltipManager,
-                            public MessageLoopForUI::Observer,
-                            public Widget::Observer {
+                            public MessageLoopForUI::Observer {
  public:
   explicit TooltipManagerViews(views::View* root_view);
   virtual ~TooltipManagerViews();
 
   // TooltipManager.
   virtual void UpdateTooltip() OVERRIDE;
   virtual void TooltipTextChanged(View* view) OVERRIDE;
   virtual void ShowKeyboardTooltip(View* view) OVERRIDE;
   virtual void HideKeyboardTooltip() OVERRIDE;
 
 #if defined(USE_WAYLAND)
   virtual base::MessagePumpObserver::EventStatus WillProcessEvent(
       ui::WaylandEvent* event) OVERRIDE;
 #else
   // MessageLoopForUI::Observer
   virtual base::EventStatus WillProcessEvent(
       const base::NativeEvent& event) OVERRIDE;
   virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
 #endif
 
-  // Widget::Observer
-  virtual void OnWidgetClosing(Widget* widget) OVERRIDE;
-
  private:
   void TooltipTimerFired();
   View* GetViewForTooltip(int x, int y, bool for_keyboard);
 
   // Updates the tooltip if required (if there is any change in the tooltip
   // text or the view.
   void UpdateIfRequired(int x, int y, bool for_keyboard);
 
   // Updates the tooltip. Gets the tooltip text from tooltip_view_ and displays
   // it at the current mouse position.
@@ skipping 12 matching lines @@
 
   scoped_ptr<Widget> tooltip_widget_;
   views::View* root_view_;
   View* tooltip_view_;
   string16 tooltip_text_;
   Label tooltip_label_;
 
   gfx::Point curr_mouse_pos_;
   base::RepeatingTimer<TooltipManagerViews> tooltip_timer_;
 
-  // true when the widget that owns us has closed.
-  bool widget_closed_;
-
   DISALLOW_COPY_AND_ASSIGN(TooltipManagerViews);
 };
 
 }  // namespace views
 
 #endif // VIEWS_WIDGET_TOOLTIP_MANAGER_VIEWS_H_