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Previously, the tab strip was using favicon by using chrome://favicon,
which depends on history and consequently did not work in incognito
mode for sites the user did not visit in a normal window.

Bug: 992972
Change-Id: I6407353c649876fe78c4ffb2425ebcd761e5d0fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850965
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704909}