De-lint PEG tokenizer.

This file is currently eval()ed.  But if you dump it to a file, there
are a few jshint issues -- including PegTokenizer being undefined
(it usually works because it inherits the definition from the lexical
environment of the eval(), which is rather sketchy).

Change-Id: Ia3697d4b70ade015d905a570e1c3e0dcc1387d31
Merge "De-lint PEG tokenizer."