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

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 274 matching lines @@
           !Write(title, CONTENT) ||
           !Write(kBookmarkEnd) ||
           !Write(kNewline)) {
         return false;
       }
       return true;
     }
 
     // Folder.
     std::string last_modified_date;
-    Value* child_values;
+    const Value* child_values;
     if (!value.GetString(BookmarkCodec::kDateModifiedKey,
                          &last_modified_date) ||
         !value.Get(BookmarkCodec::kChildrenKey, &child_values) ||
         child_values->GetType() != Value::TYPE_LIST) {
       NOTREACHED();
       return false;
     }
     if (folder_type != BookmarkNode::OTHER_NODE &&
         folder_type != BookmarkNode::MOBILE) {
       // The other/mobile folder name are not written out. This gives the effect
@@ skipping 18 matching lines @@
           !Write(kNewline) ||
           !WriteIndent() ||
           !Write(kFolderChildren) ||
           !Write(kNewline)) {
         return false;
       }
       IncrementIndent();
     }
 
     // Write the children.
-    ListValue* children = static_cast<ListValue*>(child_values);
+    const ListValue* children = static_cast<const ListValue*>(child_values);
     for (size_t i = 0; i < children->GetSize(); ++i) {
       Value* child_value;
       if (!children->Get(i, &child_value) ||
           child_value->GetType() != Value::TYPE_DICTIONARY) {
         NOTREACHED();
         return false;
       }
-      if (!WriteNode(*static_cast<DictionaryValue*>(child_value),
+      if (!WriteNode(*static_cast<const DictionaryValue*>(child_value),
                      BookmarkNode::FOLDER)) {
         return false;
       }
     }
     if (folder_type != BookmarkNode::OTHER_NODE &&
         folder_type != BookmarkNode::MOBILE) {
       // Close out the folder.
       DecrementIndent();
       if (!WriteIndent() ||
           !Write(kFolderChildrenEnd) ||
@@ skipping 141 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