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This flag was present in chrome, but ignored in headless.
This commit makes headless behave as expected.

R=eseckler@chromium.org

Bug: 714287
Change-Id: I2b06c345c1f29eb4390e7853537af9cf5d809bb8
Reviewed-on: https://chromium-review.googlesource.com/599809Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Luca Versari <veluca@google.com>
Cr-Commit-Position: refs/heads/master@{#491694}