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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 changes service_process_util_mac.mm to use the
SDK's definition of the getRelationship function instead of a
redeclaration and protect the call with an @available check instead
of respondsToSelector.

Bug: 735328
Change-Id: I2097b2343f63b74cbc198e7cf7bcaabea2e45735
Reviewed-on: https://chromium-review.googlesource.com/564308Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485395}