GitLab

Now that BadgeMediator is the only delegate for InfobarBadgeTabHelper,
LegacyInfobarBadgeTabHelperDeleagte is no longer needed.

Bug: 980800
Change-Id: Iff436e0970d4a0a058fc9120256d77c8d50ff4e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693161
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678312}