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Without this change the back button just instantly appears/disappears.

Bug: 1031363
Change-Id: I731bfb62637215f18ea90c5c34b2b51d7be4c787
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1952423Reviewed-by: Manu Cornet <manucornet@chromium.org>
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722585}