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An upcoming version of clang removes the ability to suppress
availability warnings by redeclaring functions. The new way
to suppress warnings is to either annotate the caller with an
availability attribute or enclose the function reference in an "if
(@available)" block.

This patch uses @available to protect references to
NSWorkspaceAccessibilityDisplayOptionsDidChangeNotification,
instead of comparing its address to zero.

Bug: 735328
Change-Id: If6f428da62c1486c1d608f0afe5637f9fb2f4e07
Reviewed-on: https://chromium-review.googlesource.com/564151Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485315}