Revert of SkTime updates (patchset #2 id:20001 of https://codereview.chromium.org/1521293002/ )
Revert of SkTime updates (patchset #2 id:20001 of https://codereview.chromium.org/1521293002/ )

Reason for revert:
linux Canary builder has no std::steady_clock.  Weird...

Original issue's description:
> SkTime updates
>
> 1) Use steady_clock instead of high_resolution_clock. If we don't have a
> guarantee of monotonicity, it's pretty much useless for timing things.
>
> 2) Implement Mac/iOS with <chrono> too.  This was waiting on C++11 library support.
>
> Both high_resolution_clock and steady_clock are (still) busted on MSVC 2013,
> so no change there.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/6a20871e5aeaa7e61f3348694bf436af16f824b9

TBR=herb@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1529603002

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