IndexedDB: Ship explicit commit.

Intent to Ship thread:
https://groups.google.com/a/chromium.org/d/topic/blink-dev/_-WBHYZ-rBk/discussion

Bug: 898257
Change-Id: I3c619f8958dae72e076825a5ab06dccacf2d24b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1593597
Auto-Submit: Victor Costan <pwnall@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656785}
5 files changed