Updated position: sticky support of Chrome, Opera

Support for sticky positioning, which was disabled by default anyway, was removed in Chrome 38 and Opera 25 (the Opera version is the Chrome version minus 13).
https://groups.google.com/a/chromium.org/forum/#!searchin/blink-checkins/sticky%7Csort:date/blink-checkins/Oedyb7NByWI/WRbvDH3_Yl0J
Updated scoped style support in Chrome/Opera

Support for `<style scoped>`, which was disabled by default anyway, was removed in Chrome 37 and Opera 24.
http://src.chromium.org/viewvc/blink?view=revision&revision=175993
Fixed the build (speculatively)

Added Chrome 39 back. I accidentally excluded it.
Fixed the build (speculatively)

Removed Opera 25 and 26 data. Weird.
Updated position: sticky support of Chrome

Changed Chrome 37 to not supporting sticky positioning at all, since it was actually went from the experimental status (which makes it available behind a flag) to the test status (which makes it available for internal testing only).
Merge pull request #658 from phistuck/patch-2

Updated position: sticky and scoped style support of Chrome