Correct const accessors in base/values.(h|cc), Part II (ListValue)

chrome/browser/extensions/extension_web_ui.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_WEB_UI_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEB_UI_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 32 matching lines @@
 
   // Register and unregister a dictionary of one or more overrides.
   // Page names are the keys, and chrome-extension: URLs are the values.
   // (e.g. { "newtab": "chrome-extension://<id>/my_new_tab.html" }
   static void RegisterChromeURLOverrides(Profile* profile,
       const extensions::Extension::URLOverrideMap& overrides);
   static void UnregisterChromeURLOverrides(Profile* profile,
       const extensions::Extension::URLOverrideMap& overrides);
   static void UnregisterChromeURLOverride(const std::string& page,
                                           Profile* profile,
-                                          base::Value* override);
+                                          const base::Value* override);
 
   // Called from BrowserPrefs
   static void RegisterUserPrefs(PrefService* prefs);
 
   // Get the favicon for the extension by getting an icon from the manifest.
   static void GetFaviconForURL(Profile* profile,
                                FaviconService::GetFaviconRequest* request,
                                const GURL& page_url);
 
  private:
   // Unregister the specified override, and if it's the currently active one,
   // ensure that something takes its place.
   static void UnregisterAndReplaceOverride(const std::string& page,
                                            Profile* profile,
                                            base::ListValue* list,
-                                           base::Value* override);
+                                           const base::Value* override);
 
   // TODO(aa): This seems out of place. Why is it not with the event routers for
   // the other extension APIs?
   scoped_ptr<BookmarkManagerExtensionEventRouter>
       bookmark_manager_extension_event_router_;
 
   // The URL this WebUI was created for.
   GURL url_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEB_UI_H_