DevTools: [JSDocValidator] Pass JS file names through a temporary file

This is required for the validator to work on Windows, as otherwise
the command line exceeds the maximum length there.

R=sergeyv@chromium.org, sergeyv

Review URL: https://codereview.chromium.org/669123005

git-svn-id: svn://svn.chromium.org/blink/trunk@184358 bbb929c8-8fbe-4397-9dbb-9b2b20218538