Correct const accessors in base/values.(h|cc)

chrome/browser/background/background_contents_service.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/background/background_contents_service.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
@@ skipping 413 matching lines @@
   LoadBackgroundContentsFromDictionary(profile, extension_id, contents);
 }
 
 void BackgroundContentsService::LoadBackgroundContentsFromDictionary(
     Profile* profile,
     const std::string& extension_id,
     const DictionaryValue* contents) {
   ExtensionService* extensions_service = profile->GetExtensionService();
   DCHECK(extensions_service);
 
-  DictionaryValue* dict;
+  const DictionaryValue* dict;
   if (!contents->GetDictionaryWithoutPathExpansion(extension_id, &dict) ||
       dict == NULL)
     return;
 
   string16 frame_name;
   std::string url;
   dict->GetString(kUrlKey, &url);
   dict->GetString(kFrameNameKey, &frame_name);
   LoadBackgroundContents(profile,
                          GURL(url),
@@ skipping 168 matching lines @@
     WindowOpenDisposition disposition,
     const gfx::Rect& initial_pos,
     bool user_gesture) {
   Browser* browser = browser::FindLastActiveWithProfile(
       Profile::FromBrowserContext(new_contents->GetBrowserContext()));
   if (browser) {
     chrome::AddWebContents(browser, NULL, new_contents, disposition,
                            initial_pos, user_gesture);
   }
 }