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base::Optional::value() already does this; change operator* and
operator-> to match, and ensure the behavior is tested.

Change-Id: Id686b86d0e68360dea3a92d01206aefde6782a16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1531498
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649250}