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

chrome/browser/bookmarks/bookmark_html_writer.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_html_writer.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
@@ skipping 315 matching lines @@
           !Write(kFolderChildren) ||
           !Write(kNewline)) {
         return false;
       }
       IncrementIndent();
     }
 
     // Write the children.
     const ListValue* children = static_cast<const ListValue*>(child_values);
     for (size_t i = 0; i < children->GetSize(); ++i) {
-      Value* child_value;
+      const Value* child_value;
       if (!children->Get(i, &child_value) ||
           child_value->GetType() != Value::TYPE_DICTIONARY) {
         NOTREACHED();
         return false;
       }
       if (!WriteNode(*static_cast<const DictionaryValue*>(child_value),
                      BookmarkNode::FOLDER)) {
         return false;
       }
     }
@@ skipping 147 matching lines @@
   // BookmarkModel isn't thread safe (nor would we want to lock it down
   // for the duration of the write), as such we make a copy of the
   // BookmarkModel using BookmarkCodec then write from that.
   if (fetcher == NULL) {
     fetcher = new BookmarkFaviconFetcher(profile, path, observer);
     fetcher->ExportBookmarks();
   }
 }
 
 }  // namespace bookmark_html_writer