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Observing Browserstates should not happen in BrowserViewWrangler as that
object primarily handles UI configuration. Additionally,
BrowserViewWrangler is a scene-scoped object in the multi-window design
of Chrome which would break breadcrumb collection once a window is
closed.

Bug: None
Change-Id: I36f6b4556457c45c74ec836658a75d9eb3f78b71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008440
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733779}