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This is primarily motivated by the chrome://settings case, which
currently is never autocompleted because the builtin provider only
autocompletes in cases where there is a single suggestion. And any input
that matches chrome://settings also matches subpages such as
chrome://settings/autofill.

However, this change also affects one other current case,
chrome://chrome and chrome://chrome-urls. The former will now be inline
autocompleted.

Bug: 816450
Change-Id: I9671033c27c7f8bab1f7cfcbb2989e507e1aeee5
Reviewed-on: https://chromium-review.googlesource.com/976397
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550657}