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This is a reland of ccf0e2f9

Fixes TSAN issue in the constructor of sql::Database
by moving it to the main thread.

Original change's description:
> Turn on Media History by default
>
> BUG=1024351
>
> Change-Id: Id01595e63f5f776a226087741ef602ba30b80328
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295224
> Auto-Submit: Becca Hughes <beccahughes@chromium.org>
> Commit-Queue: Tommy Steimel <steimel@chromium.org>
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#787954}

Bug: 1024351
Change-Id: I19be665637f5c28261f7197547ddc5fe6671127e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296884Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788312}