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As a tabmodel needs to be deprecated, this CL moves all
CRWWebStateObserver functions into a web state list metrics browser agent
and omnibox geolocation tab helper created here to move them out of
TabModel.

Bug: 1050116,1045575
Change-Id: I9b0f14c6fc89b5d7304a2cd2e5b5bd0af44838b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2289856
Commit-Queue: Nazerke Kalidolda <nazerke@google.com>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801855}