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If clicking on a tile triggers a search, currently the AQS params are
missing as the search URL is built directly from TemplateUrlService.
This CL fixes that behavior by going through the AutocompleteController
to find the right AutocompleteMatch, and build the search URL from it.

BUG=1110034

Change-Id: I6479726c93b8dd71d21c2753c35284d7fd5abc35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324770
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Ender 💬 = 🕐 (ping me for faster reviews) <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#794667}