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

chrome/browser/bookmarks/bookmark_html_writer.cc

Index: chrome/browser/bookmarks/bookmark_html_writer.cc
diff --git a/chrome/browser/bookmarks/bookmark_html_writer.cc b/chrome/browser/bookmarks/bookmark_html_writer.cc
index 2800e52687901ba8801829a328009975f8e04422..cb48e07304adb1cf79fd24755c40dd1e1113239f 100644
--- a/chrome/browser/bookmarks/bookmark_html_writer.cc
+++ b/chrome/browser/bookmarks/bookmark_html_writer.cc
@@ -333,7 +333,7 @@ class Writer : public base::RefCountedThreadSafe<Writer> {
     // 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();