66c1b3aacc
Don't allow to use invalid names in refactorings. R=brianwilkerson@google.com BUG= https://code.google.com/p/dart/issues/detail?id=18296 Review URL: https://codereview.chromium.org//585073002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@40521 260f80e4-7a28-3924-810f-c04153c831b5