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This CL addresses a case where one user profile has one and only one
window and it is snapped, and another user profile has no windows.
Overview mode shall end when you switch from the profile with the
snapped window to the one with no windows.

Test: manual
Bug: 934477
Change-Id: I9f55ee8c5adfde148d6b27e5e0aee9d52f788985
Reviewed-on: https://chromium-review.googlesource.com/c/1481799Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634790}