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There are several trigger points for calling Browser::Create in
browser_navigator.cc which do not check if browser can be created for
the given profile.

Checking for possibility of browser creation is added to these cases
and a nullptr is returned if browser can't be created.

Bug: 1162794
Change-Id: Ie06419165700c41acd69f30945bd11471961443e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2609130Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840970}