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The present CL moves ShowAppCannotSnapToast() from split_view_controller
to split_view_utils. The latter is a much more natural choice, because
the function is used outside split_view_controller, it does not use
anything inside split_view_controller, and it goes hand in hand with
CanSnapInSplitview() which is already in split_view_utils.

Test: manual
Bug: 970013
Change-Id: I6bd4e2044a0622d5604adbb287045befcdf20eaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639666Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666054}