Use original program in ES5 if mitigation would not make any changes https://codereview.appspot.com/7063052
Use original program in ES5 if mitigation would not make any changes
https://codereview.appspot.com/7063052

The parse and render in mitigateGotchas removes comments and changes
line numbers.  If there is not changes made during the mitigateGotchas
stage, we can use SES to sandbox the original rather than mitigated
code.

R=kpreid.switchb.org@gmail.com


git-svn-id: eb21526166532bd3afc2c1499c0cf105ce815f5a@5211 360991c0-9f3b-0410-ba87-8b362a00edf4

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