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Both the email and google app modules will show the bookmark bar. This
change makes it so that the state of the bookmark bar is returned to the
way it was before it was shown if no bookmarks are added.

R=scottchen@chromium.org

Bug: 881937
Change-Id: I64d0a03f6747589d594720dad406e14ee4483ca8
Reviewed-on: https://chromium-review.googlesource.com/c/1302316
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603761}