Fixes ungraceful handling of destroyed GlobalError GlobalErrorBubbleView.

chrome/browser/ui/global_error/global_error.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 CHROME_BROWSER_UI_GLOBAL_ERROR_GLOBAL_ERROR_H_
 #define CHROME_BROWSER_UI_GLOBAL_ERROR_GLOBAL_ERROR_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 69 matching lines @@
   // Returns true if the bubble needs a close(x) button.
   virtual bool ShouldShowCloseButton() const;
   // Returns true if the accept button needs elevation icon (only effective
   // on Windows platform).
   virtual bool ShouldAddElevationIconToAcceptButton();
   // Returns the cancel button label for the bubble view. To hide the cancel
   // button return an empty string.
   virtual base::string16 GetBubbleViewCancelButtonLabel() = 0;
   // Called when the bubble view is closed. |browser| is the Browser that the
   // bubble view was shown on.
-  void BubbleViewDidClose(Browser* browser);
+  virtual void BubbleViewDidClose(Browser* browser);
   // Notifies subclasses that the bubble view is closed. |browser| is the
   // Browser that the bubble view was shown on.
   virtual void OnBubbleViewDidClose(Browser* browser) = 0;
   // Called when the user clicks on the accept button. |browser| is the
   // Browser that the bubble view was shown on.
   virtual void BubbleViewAcceptButtonPressed(Browser* browser) = 0;
   // Called when the user clicks the cancel button. |browser| is the
   // Browser that the bubble view was shown on.
   virtual void BubbleViewCancelButtonPressed(Browser* browser) = 0;
   // Returns true if the bubble should close when focus is lost. If false, the
   // bubble will stick around until the user explicitly acknowledges it.
   // Defaults to true.
   virtual bool ShouldCloseOnDeactivate() const;
 
   // GlobalError overrides:
   bool HasBubbleView() override;
   bool HasShownBubbleView() override;
   void ShowBubbleView(Browser* browser) override;
   GlobalErrorBubbleViewBase* GetBubbleView() override;
 
  private:
   bool has_shown_bubble_view_;
   GlobalErrorBubbleViewBase* bubble_view_;
 
   DISALLOW_COPY_AND_ASSIGN(GlobalErrorWithStandardBubble);
 };
 
 #endif  // CHROME_BROWSER_UI_GLOBAL_ERROR_GLOBAL_ERROR_H_