Remove owned views from AXAuraObjCache when widget is deleted.

ui/views/accessibility/ax_aura_obj_cache.h

 // Copyright 2014 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_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_
 #define UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 29 matching lines @@
 
   // Gets the next unique id for this cache. Useful for non-Aura view backed
   // views.
   int32 GetNextID() { return current_id_++; }
 
   // Removes an entry from this cache based on an Aura view.
   void Remove(View* view);
   void Remove(Widget* widget);
   void Remove(aura::Window* window);
 
+  // Removes a view and all of its descendants from the cache.
+  void RemoveViewSubtree(View* view);
+
   // Lookup a cached entry based on an id.
   AXAuraObjWrapper* Get(int32 id);
 
   // Remove a cached entry based on an id.
   void Remove(int32 id);
 
   // Get all top level windows this cache knows about.
   void GetTopLevelWindows(std::vector<AXAuraObjWrapper*>* children);
 
   // Indicates if this object's currently being destroyed.
@@ skipping 24 matching lines @@
 
   // True immediately when entering this object's destructor.
   bool is_destroying_;
 
   DISALLOW_COPY_AND_ASSIGN(AXAuraObjCache);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_