test: set SAFARI_BIN in karma.conf
test: set SAFARI_BIN in karma.conf

sets SAFARI_BIN to point to Safari Technology Preview
when BVER is set to experimental. This makes karma tests run in STP.

xdumaine/adapter,Acidburn0zzz/adapter,Acidburn0zzz/adapter,Acidburn0zzz/adapter,webrtc/adapter,webrtc/adapter,xdumaine/adapter