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It looks like every client of this code is passing in a delegate,
so we can simplify it a little by removing the if checks.

Change-Id: Ie32edc629117d9c204482d518f13c7beb5bf1cf7
Reviewed-on: https://chromium-review.googlesource.com/1106801Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568698}