Ensure app install is aborted when the install dialog is closed

ui/views/window/dialog_client_view.h

 // Copyright (c) 2012 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 UI_VIEWS_WINDOW_DIALOG_CLIENT_VIEW_H_
 #define UI_VIEWS_WINDOW_DIALOG_CLIENT_VIEW_H_
 
 #include "ui/base/ui_base_types.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/focus/focus_manager.h"
@@ skipping 29 matching lines @@
 
   // Accessors in case the user wishes to adjust these buttons.
   LabelButton* ok_button() const { return ok_button_; }
   LabelButton* cancel_button() const { return cancel_button_; }
 
   // Update the dialog buttons to match the dialog's delegate.
   void UpdateDialogButtons();
 
   // ClientView implementation:
   virtual bool CanClose() OVERRIDE;
+  virtual void WidgetClosing() OVERRIDE;
   virtual DialogClientView* AsDialogClientView() OVERRIDE;
   virtual const DialogClientView* AsDialogClientView() const OVERRIDE;
 
   // FocusChangeListener implementation:
   virtual void OnWillChangeFocus(View* focused_before,
                                  View* focused_now) OVERRIDE;
   virtual void OnDidChangeFocus(View* focused_before,
                                 View* focused_now) OVERRIDE;
 
   // View implementation:
@@ skipping 66 matching lines @@
   // http://crbug.com/71940). This is used to avoid notifying the delegate
   // twice, which can have bad consequences.
   bool notified_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DialogClientView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WINDOW_DIALOG_CLIENT_VIEW_H_