GitLab

This just makes _browserViewWrangler a property and updates calls.
This will allow for cleaner CLs moving code to SceneController.

Bug: none
Change-Id: Ic3118c54ac0799a0089a0e5a159d68d672b899c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003854Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732880}