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

chrome/browser/extensions/extension_toolbar_model.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 "chrome/browser/extensions/extension_toolbar_model.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/message_loop/message_loop.h"
@@ skipping 637 matching lines @@
     if (toolbar_items()[i]->id() == id)
       return i;
   }
   return -1;
 }
 
 bool ExtensionToolbarModel::ShowExtensionActionPopup(
     const Extension* extension,
     Browser* browser,
     bool grant_active_tab) {
-  ObserverListBase<Observer>::Iterator it(observers_);
+  ObserverListBase<Observer>::Iterator it(&observers_);
   Observer* obs = NULL;
   // Look for the Observer associated with the browser.
   // This would be cleaner if we had an abstract class for the Toolbar UI
   // (like we do for LocationBar), but sadly, we don't.
   while ((obs = it.GetNext()) != NULL) {
     if (obs->GetBrowser() == browser)
       return obs->ShowExtensionActionPopup(extension, grant_active_tab);
   }
   return false;
 }
@@ skipping 64 matching lines @@
   if (is_highlighting_) {
     highlighted_items_.clear();
     is_highlighting_ = false;
     if (old_visible_icon_count_ != visible_icon_count_)
       SetVisibleIconCount(old_visible_icon_count_);
     FOR_EACH_OBSERVER(Observer, observers_, ToolbarHighlightModeChanged(false));
   }
 }
 
 }  // namespace extensions