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Currently, the icon persists across navigations, which is wrong.

Bug: 894955
Change-Id: I5e2028668a249c0baeb3976297c499df3e61b3b3
Reviewed-on: https://chromium-review.googlesource.com/c/1279208
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599982}