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Previously the passed callback was only called if we actually decided
to do the load, now we always call it. This is to support chaining
together async loading operations. I have no insight into why the
callback is dropped in the original code.

Bug: 715355
Change-Id: I5c40f862c0894ce5261880482b5da87ccaf6edfa
Reviewed-on: https://chromium-review.googlesource.com/1098737
Commit-Queue: Stuart Langley <slangley@chromium.org>
Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567603}