[Extensions] Fix extension toolbar crash

chrome/browser/extensions/extension_toolbar_model.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_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_
 
 #include "base/compiler_specific.h"
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 169 matching lines @@
       ExtensionAction* extension_action,
       content::WebContents* web_contents,
       content::BrowserContext* browser_context) override;
 
   // To be called after the extension service is ready; gets loaded extensions
   // from the ExtensionRegistry and their saved order from the pref service
   // and constructs |toolbar_items_| from these data. IncognitoPopulate()
   // takes the shortcut - looking at the regular model's content and modifying
   // it.
   void InitializeExtensionList();
-  void Populate(const ExtensionIdList& positions);
+  void Populate(ExtensionIdList* positions);
   void IncognitoPopulate();
 
   // Save the model to prefs.
   void UpdatePrefs();
 
   // Updates |extension|'s browser action visibility pref if the browser action
   // is in the overflow menu and should be considered hidden.
   void MaybeUpdateVisibilityPref(const Extension* extension, size_t index);
 
   // Calls MaybeUpdateVisibilityPref() for each extension in |toolbar_items|.
@@ skipping 65 matching lines @@
   base::Closure pref_change_callback_;
 
   base::WeakPtrFactory<ExtensionToolbarModel> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionToolbarModel);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_