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The default behavior remains the same, with InfoBarView having a close button.
This change is needed for implementing the tab sharing infobar (see bug).

Bug: 927949
Change-Id: I795c868508148b5a8a1647768474b0d1dc89cd36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599689
Commit-Queue: Marina Ciocea <marinaciocea@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658463}