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This is a minimum InfoBarDelegate subclass to use for tests.

Bug: none
Change-Id: Iee4ea0d819ac436ea64b471a166c6399df3cebbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1959664
Auto-Submit: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723619}