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Instead of showing the Search Provider favicon in the omnibox, this
experiment shows a generic magnifying glass icon.

This also applies to the NTP, as the omnibox in the NTP has always had
the same icon as the omnibox showing a search suggestion.

Doing something different would require a more extensive change.

Bug: 931836
Change-Id: Ia16422b8e4c710b6d664d10c20a322b1083dd57a
Reviewed-on: https://chromium-review.googlesource.com/c/1471247Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632009}