Fix crash under ExclusiveAccessBubbleViews::AnimationProgressed().

chrome/browser/ui/views/exclusive_access_bubble_views_context.h

 // Copyright (c) 2015 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_VIEWS_EXCLUSIVE_ACCESS_BUBBLE_VIEWS_CONTEXT_H_
 #define CHROME_BROWSER_UI_VIEWS_EXCLUSIVE_ACCESS_BUBBLE_VIEWS_CONTEXT_H_
 
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/native_widget_types.h"
 
 class ExclusiveAccessManager;
@@ skipping 29 matching lines @@
   virtual gfx::Point GetCursorPointInParent() const = 0;
 
   // Return the current bounds (not restored bounds) of the parent window.
   virtual gfx::Rect GetClientAreaBoundsInScreen() const = 0;
 
   // Returns true if immersive mode is enabled.
   virtual bool IsImmersiveModeEnabled() = 0;
 
   // Returns the bounds of the top level View in screen coordinate system.
   virtual gfx::Rect GetTopContainerBoundsInScreen() = 0;
+
+  // Destroy any exclusive access bubble. This allows the bubble to ask its
+  // owner to clean up when the bubble observes its native widget being
+  // destroyed before the owner requested it.
+  virtual void DestroyAnyExclusiveAccessBubble() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_EXCLUSIVE_ACCESS_BUBBLE_VIEWS_CONTEXT_H_