Update DEPS.xwalk to include blink::ScreenOrientation enabling

Update DEPS.xwalk to include blink::ScreenOrientation enabling:
https://github.com/crosswalk-project/blink-crosswalk/pull/15
and
https://github.com/crosswalk-project/chromium-crosswalk/pull/168

BUG=XWALK-1820
Merge pull request #2080 from pozdnyakov/enable_screen_orintation

Update DEPS.xwalk to include blink::ScreenOrientation enabling