Silence license block presubmit check
Silence license block presubmit check

Presubmit is checking for a Chromium-style license block, which isn't what
we're using in Blink. At some point we'll want to add a proper license check,
but not today.

Review URL: https://codereview.chromium.org/13610004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@147545 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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