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This resolves some TODOs left over from shelf refactoring.

Eliminate various GetAlignment() utility functions and instead call into
WmShelf::GetAlignment() directory.

Prefer WmShelf::IsHorizontalAlignment() to the bare utility fuction.

Fix IWYU violations.

BUG=635963
TEST=ash_unittests
TBR=dmazzoni@chromium.org for IWYU in c/b/chromeos/accessibility

Review-Url: https://codereview.chromium.org/2676673005
Cr-Commit-Position: refs/heads/master@{#448035}