Remove unused variable declaration.

This issue was found by a linter.

R=kaiwang@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/22339009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@216819 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/bookmarks/bookmark_model_test_utils.cc

@@ -115,7 +115,6 @@ void BookmarkModelTestUtils::AddNodesFromModelString(
     const BookmarkNode* node,
     const std::string& model_string) {
   DCHECK(node);
-  const std::string folder_tell(":[");
   std::string::size_type start_pos = 0;
   std::string::size_type end_pos =
       AddNodesFromString(model, node, model_string, start_pos);