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Currently clients of the SetCan{Maximize,Minimize,Resize} setters need
to remember to call Widget::OnSizeConstraintsChanged afterwards, which
is obviously dangerous. Just call it from inside the setters, and
then we can stop calling it everywhere else. OnSizeConstraintsChanged
is idempotent (though a bit expensive) so temporarily having two calls
to it won't hurt anything.

This change also fixes ViewEventTestBase::GetWidget() to tolerate
being called early in the object's lifecycle.

Bug: 1075649
Change-Id: I11dcf39e6b1ad86f8d5f5adfa973e5fd339dd36f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485195
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819017}