GitLab

Moves the implementation of BrowserStateStorageSwitching to
BrowserViewWrangler and inverses the dependency so that MainController
now needs BVWrangler to switch contexts. This makes sense in multiwindow
world where BVWranglers are per-scene.

Bug: none
Change-Id: Idd9b76480c425a3508a476438126b656bf362cef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036007Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738581}