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This CL makes CurrentTextIsURL and the match generation mechanism
gracefully handle Query in Omnibox.

It also adds some tests for that.

Bug: 874592
Change-Id: I84e2bda6b489173a0a56ba2d6f461a1d0207fb11
Reviewed-on: https://chromium-review.googlesource.com/c/1263421
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Kevin Bailey <krb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597615}