Fix failing webkitpy unittest.

One of the webkitpy unittests failed if you redirected the output
of test-webkitpy to a file. This CL fixes that, by implementing
a mock method that I had missed earlier.

[email protected]
BUG=726772

Change-Id: I49a8ed7c3453a1ff0ae03d43b64d1ea5af539c02
Reviewed-on: https://chromium-review.googlesource.com/541974
Reviewed-by: Quinten Yearsley <[email protected]>
Commit-Queue: Dirk Pranke <[email protected]>
Cr-Commit-Position: refs/heads/master@{#481226}
1 file changed