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This allows the readlink call to trap into a broker process rather
than being denied inside a sandbox.

Bug: 715679
Change-Id: Id03f45b298ba3c09de9a9b8ac3afc93a368bb4d5
Reviewed-on: https://chromium-review.googlesource.com/795012Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520996}