Bob Nystrom 851cbb0fb3 Delete stale .js or .err files when generating codegen output.
This ensures that, for example, if you fix a test to no longer have
errors, then the old ".err" file is removed.

R=jmesserly@google.com

Review URL: https://codereview.chromium.org/1978983002 .
2016-05-13 16:34:13 -07:00
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