Sanitize referrer headers set by workers
Sanitize referrer headers set by workers

BUG=453737
R=horo@chromium.org,mkwst@chromium.org

Review URL: https://codereview.chromium.org/890723003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@189341 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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