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Just moves ownership of BrowserViewWrangler to SceneController.
It is still created by MainController.

Bug: 1045658
Change-Id: Ie886cf0e54b236e66aa07ffe33be840fac327623
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2084993
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746725}