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If the navigation state of the active state changes such in a way that
indicates the URL has changed, we should update the URL bar.

Also adds a browser test to verify the expected behavior.

Bug: 1025607

Change-Id: I58431ac15fbb04d516f4a2637d4717431346fb25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094134
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748868}