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The majority of the storage code uses incognito instead of
off_the_record. This CL gets WebSQL in line, to reduce cognitive
overhead for readers.

Change-Id: I8fcce58f82da24e22aa7b14b201dc7ed935b1114
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2634551
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844845}