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This CL replaces the current infobars if there are existing ones by
removing them.

Bug: 999222
Change-Id: Id3d84ca24a935c6c3420dfeb8194d0610278a631
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775213
Commit-Queue: Jun Cai <juncai@chromium.org>
Reviewed-by: Ayu Ishii <ayui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692123}