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The badge tab helper's delegate needs to be set on
initialization, otherwise it the mediator won't be informed
of badge updates until after the active WebState is reset.

Change-Id: Ie2774f2d0dc1929e9489c12a7e8cac6cca007794
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026729Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Auto-Submit: David Jean <djean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736556}