Some methods date back to when aura::Window could not be used in mash,
which is no longer the case.

Inline laser pointer, partial magnifier, and modal window calls where
they are used. Also allow laser pointer and partial magnifier to be
enabled under mash, since the controllers exist now.

Bug: none
Test: ash_unittests (normal, --mus, --mash)
Change-Id: I545450a863c2935ba3f262fa2a9a62e0772a033b
Reviewed-on: https://chromium-review.googlesource.com/742494


Reviewed-by: Elliot Glaysher <erg@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512624}