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

chrome/browser/bookmarks/bookmark_extension_api.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/bookmarks/bookmark_extension_api.h"
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/i18n/time_formatting.h"
@@ skipping 687 matching lines @@
 };
 
 // Mapper for 'bookmarks.create'.  Maps "same input to bookmarks.create" to a
 // unique bucket.
 class CreateBookmarkBucketMapper : public BookmarkBucketMapper<std::string> {
  public:
   explicit CreateBookmarkBucketMapper(Profile* profile) : profile_(profile) {}
   // TODO(tim): This should share code with CreateBookmarkFunction::RunImpl,
   // but I can't figure out a good way to do that with all the macros.
   virtual void GetBucketsForArgs(const ListValue* args, BucketList* buckets) {
-    DictionaryValue* json;
+    const DictionaryValue* json;
     if (!args->GetDictionary(0, &json))
       return;
 
     std::string parent_id;
     if (json->HasKey(keys::kParentIdKey)) {
       if (!json->GetString(keys::kParentIdKey, &parent_id))
         return;
     }
     BookmarkModel* model = BookmarkModelFactory::GetForProfile(profile_);
 
@@ skipping 241 matching lines @@
                                            int index,
                                            void* params) {
 #if !defined(OS_ANDROID)
   // Android does not have support for the standard exporter.
   // TODO(jgreenwald): remove ifdef once extensions are no longer built on
   // Android.
   bookmark_html_writer::WriteBookmarks(profile(), path, NULL);
 #endif
   Release();  // Balanced in BookmarksIOFunction::SelectFile()
 }