Provide backup #defines for things introduced in SDK 10.0.10240.0
Provide backup #defines for things introduced in SDK 10.0.10240.0

This follows discussion on
https://chromium-review.googlesource.com/409098/.

Change-Id: Ic82b64a14bb89cfdf1c88b1482cc2c2c9c0c2589
Reviewed-on: https://chromium-review.googlesource.com/409604
Reviewed-by: Scott Graham <e134406e1863f3b48b0795831afac5c0595efb36@chromium.org>

chromium/crashpad,chromium/crashpad,atom/crashpad,atom/crashpad,atom/crashpad,chromium/crashpad