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The AutofillWebDataService APIs can be consumed on any thread, not just the DB
thread, so it's not necessary to post to the DB thread to call them.

The AwFormDatabaseService itself is only accessed on one thread, and blocks
while it has an ongoing HasFormData() call, so there can't be multiple requests
in-flight at once.  This lets us remove the entire result map.

Bug: None
Change-Id: I7b6cd5272cb569d00fcd4cc6f89f22082100184c
Reviewed-on: https://chromium-review.googlesource.com/578298
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Selim Gurun <sgurun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488163}