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We had this feature to better support Query in Omnibox.

Now that Query in Omnibox has been deleted this is no longer needed,
since plaintext URLs are generally handled somewhat better than links.

This CL also removes some stale references to Query in Omnibox in
some comments.

Bug: 874592
Change-Id: Ia1cf70d0a0598897202e3241a90e459d470d3620
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250831Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780005}