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Since SampleOrderingSpec::MAY_SHUFFLE is the only one used in production
code, there is no need to specify the SampleOrderingSpec parameter hence
SampleOrderingSpec enum is also retired.

Bug: 851163
Change-Id: Ie9bf7c39d036db55b1533c4fe3b3f3293a2a8dbf
Reviewed-on: https://chromium-review.googlesource.com/1171584
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582379}