Visual Studio SDKs now include the ability for Windows Store applications to
use the Sleep( ) function.

Change-Id: Iaf2a978e778f82e918ba14a58bbb1807cc1fbaf4
Reviewed-on: https://chromium-review.googlesource.com/309890Tested-by: Cooper Partin <coopp@microsoft.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>