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

chrome/browser/bookmarks/bookmark_extension_api.cc

Index: chrome/browser/bookmarks/bookmark_extension_api.cc
diff --git a/chrome/browser/bookmarks/bookmark_extension_api.cc b/chrome/browser/bookmarks/bookmark_extension_api.cc
index 0ef128ea58e6c5ddfb25eb885923a49e578aef49..af082f773eef5e7d5892d3b210a6c7aea63c12bd 100644
--- a/chrome/browser/bookmarks/bookmark_extension_api.cc
+++ b/chrome/browser/bookmarks/bookmark_extension_api.cc
@@ -705,7 +705,7 @@ class CreateBookmarkBucketMapper : public BookmarkBucketMapper<std::string> {
   // 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;