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Moves the ownership of the main browser state to the app state.

Bug: 1045659
Change-Id: I37eea450d29d12c5fa31cdbf4a447667dc039a12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414310
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809049}