base: Stop passing a non-const ref to ObserverListBase::Iterator.

ui/aura/window.cc

 // 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.
 
 #include "ui/aura/window.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 244 matching lines @@
   // Then destroy the children.
   RemoveOrDestroyChildren();
 
   // The window needs to be removed from the parent before calling the
   // WindowDestroyed callbacks of delegate and the observers.
   if (parent_)
     parent_->RemoveChild(this);
 
   if (delegate_)
     delegate_->OnWindowDestroyed(this);
-  ObserverListBase<WindowObserver>::Iterator iter(observers_);
+  ObserverListBase<WindowObserver>::Iterator iter(&observers_);
   for (WindowObserver* observer = iter.GetNext(); observer;
        observer = iter.GetNext()) {
     RemoveObserver(observer);
     observer->OnWindowDestroyed(this);
   }
 
   // Clear properties.
   for (std::map<const void*, Value>::const_iterator iter = prop_map_.begin();
        iter != prop_map_.end();
        ++iter) {
@@ skipping 1188 matching lines @@
       return window;
     if (offset)
       *offset += window->bounds().OffsetFromOrigin();
   }
   if (offset)
     *offset = gfx::Vector2d();
   return NULL;
 }
 
 }  // namespace aura