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MainController observes WSL to know when the last {normal|incognito}
tab is closed. Conceptually, this seems like a Scene-level concern.
However, clearing browsing data might be an App-level concept, so I
keep the logic in MainController for now.

Bug: none
Change-Id: I0b3453518f4f0390a34f77ce27817f4af1f4d650
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003135
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733390}