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When go/herd-immunity (Google internal doc) extension is enabled,
unelide URLs and turn off Query in Omnibox. We're choosing to hard-code
the extension id since only one extension needs this, and we don't need
the added complexity of making this an extension API.

Bug: 914422
Change-Id: I1c8f3ddd6f236d2812adad6272225aa07d47fb54
Reviewed-on: https://chromium-review.googlesource.com/c/1415751
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625451}