Reenable SIMD.js support after the M40 rebase.
Reenable SIMD.js support after the M40 rebase.

Commit 8c5d886 ("DEPS.xwalk: Roll v8-crosswalk (3bfc597 -> 11bb7b4)")
correctly rolled v8-crosswalk, but forgot to uncomment out the piece of
code that enables SIMD.js support by default.

BUG=XWALK-3210

amaniak/crosswalk,Pluto-tv/crosswalk,RafuCater/crosswalk,lincsoon/crosswalk,stonegithubs/crosswalk,zliang7/crosswalk,axinging/crosswalk,heke123/crosswalk,darktears/crosswalk,bestwpw/crosswalk,crosswalk-project/crosswalk-efl,jpike88/crosswalk,rakuco/crosswalk,tomatell/crosswalk,leonhsl/crosswalk,zliang7/crosswalk,darktears/crosswalk,tedshroyer/crosswalk,zeropool/crosswalk,alex-zhang/crosswalk,minggangw/crosswalk,darktears/crosswalk,Bysmyyr/crosswalk,Bysmyyr/crosswalk,lincsoon/crosswalk,XiaosongWei/crosswalk,zliang7/crosswalk,jondwillis/crosswalk,jondong/crosswalk,minggangw/crosswalk,chuan9/crosswalk,heke123/crosswalk,xzhan96/crosswalk,siovene/crosswalk,jondwillis/crosswalk,hgl888/crosswalk,dreamsxin/crosswalk,jondong/crosswalk,dreamsxin/crosswalk,crosswalk-project/crosswalk-efl,siovene/crosswalk,rakuco/crosswalk,tomatell/crosswalk,marcuspridham/crosswalk,weiyirong/crosswalk-1,pk-sam/crosswalk,DonnaWuDongxia/crosswalk,dreamsxin/crosswalk,Pluto-tv/crosswalk,leonhsl/crosswalk,Pluto-tv/crosswalk,siovene/crosswalk,PeterWangIntel/crosswalk,lincsoon/crosswalk,bestwpw/crosswalk,rakuco/crosswalk,baleboy/crosswalk,baleboy/crosswalk,pk-sam/crosswalk,jondong/crosswalk,mrunalk/crosswalk,stonegithubs/crosswalk,alex-zhang/crosswalk,zliang7/crosswalk,baleboy/crosswalk,stonegithubs/crosswalk,chuan9/crosswalk,jondwillis/crosswalk,xzhan96/crosswalk,zeropool/crosswalk,crosswalk-project/crosswalk-efl,lincsoon/crosswalk,chuan9/crosswalk,jondwillis/crosswalk,axinging/crosswalk,marcuspridham/crosswalk,hgl888/crosswalk-efl,rakuco/crosswalk,mrunalk/crosswalk,amaniak/crosswalk,axinging/crosswalk,pk-sam/crosswalk,ZhengXinCN/crosswalk,zliang7/crosswalk,lincsoon/crosswalk,hgl888/crosswalk-efl,marcuspridham/crosswalk,pk-sam/crosswalk,chinakids/crosswalk,minggangw/crosswalk,pk-sam/crosswalk,xzhan96/crosswalk,DonnaWuDongxia/crosswalk,alex-zhang/crosswalk,tomatell/crosswalk,amaniak/crosswalk,pk-sam/crosswalk,crosswalk-project/crosswalk,jondong/crosswalk,ZhengXinCN/crosswalk,darktears/crosswalk,lincsoon/crosswalk,baleboy/crosswalk,RafuCater/crosswalk,marcuspridham/crosswalk,hgl888/crosswalk-efl,xzhan96/crosswalk,zeropool/crosswalk,bestwpw/crosswalk,hgl888/crosswalk,Pluto-tv/crosswalk,rakuco/crosswalk,weiyirong/crosswalk-1,bestwpw/crosswalk,darktears/crosswalk,RafuCater/crosswalk,lincsoon/crosswalk,Bysmyyr/crosswalk,hgl888/crosswalk-efl,hgl888/crosswalk-efl,alex-zhang/crosswalk,baleboy/crosswalk,rakuco/crosswalk,marcuspridham/crosswalk,crosswalk-project/crosswalk,Pluto-tv/crosswalk,ZhengXinCN/crosswalk,stonegithubs/crosswalk,mrunalk/crosswalk,heke123/crosswalk,Bysmyyr/crosswalk,rakuco/crosswalk,weiyirong/crosswalk-1,crosswalk-project/crosswalk,tomatell/crosswalk,jondong/crosswalk,weiyirong/crosswalk-1,crosswalk-project/crosswalk-efl,leonhsl/crosswalk,xzhan96/crosswalk,dreamsxin/crosswalk,siovene/crosswalk,crosswalk-project/crosswalk,zliang7/crosswalk,chinakids/crosswalk,mrunalk/crosswalk,DonnaWuDongxia/crosswalk,hgl888/crosswalk-efl,minggangw/crosswalk,axinging/crosswalk,jondwillis/crosswalk,jondwillis/crosswalk,DonnaWuDongxia/crosswalk,chuan9/crosswalk,XiaosongWei/crosswalk,ZhengXinCN/crosswalk,stonegithubs/crosswalk,heke123/crosswalk,RafuCater/crosswalk,siovene/crosswalk,amaniak/crosswalk,jpike88/crosswalk,dreamsxin/crosswalk,PeterWangIntel/crosswalk,hgl888/crosswalk,baleboy/crosswalk,leonhsl/crosswalk,crosswalk-project/crosswalk-efl,DonnaWuDongxia/crosswalk,leonhsl/crosswalk,hgl888/crosswalk-efl,marcuspridham/crosswalk,amaniak/crosswalk,amaniak/crosswalk,PeterWangIntel/crosswalk,hgl888/crosswalk,DonnaWuDongxia/crosswalk,PeterWangIntel/crosswalk,hgl888/crosswalk,hgl888/crosswalk,bestwpw/crosswalk,RafuCater/crosswalk,crosswalk-project/crosswalk,tedshroyer/crosswalk,hgl888/crosswalk,mrunalk/crosswalk,minggangw/crosswalk,crosswalk-project/crosswalk-efl,Bysmyyr/crosswalk,XiaosongWei/crosswalk,leonhsl/crosswalk,ZhengXinCN/crosswalk,heke123/crosswalk,mrunalk/crosswalk,rakuco/crosswalk,tedshroyer/crosswalk,zliang7/crosswalk,chuan9/crosswalk,alex-zhang/crosswalk,jpike88/crosswalk,heke123/crosswalk,xzhan96/crosswalk,tedshroyer/crosswalk,PeterWangIntel/crosswalk,crosswalk-project/crosswalk,marcuspridham/crosswalk,leonhsl/crosswalk,ZhengXinCN/crosswalk,chinakids/crosswalk,PeterWangIntel/crosswalk,marcuspridham/crosswalk,Pluto-tv/crosswalk,ZhengXinCN/crosswalk,xzhan96/crosswalk,dreamsxin/crosswalk,XiaosongWei/crosswalk,baleboy/crosswalk,chinakids/crosswalk,zeropool/crosswalk,minggangw/crosswalk,zeropool/crosswalk,zeropool/crosswalk,tomatell/crosswalk,axinging/crosswalk,axinging/crosswalk,heke123/crosswalk,crosswalk-project/crosswalk,lincsoon/crosswalk,heke123/crosswalk,alex-zhang/crosswalk,minggangw/crosswalk,weiyirong/crosswalk-1,stonegithubs/crosswalk,zeropool/crosswalk,crosswalk-project/crosswalk,baleboy/crosswalk,tomatell/crosswalk,jpike88/crosswalk,bestwpw/crosswalk,jpike88/crosswalk,RafuCater/crosswalk,dreamsxin/crosswalk,jondwillis/crosswalk,chuan9/crosswalk,Pluto-tv/crosswalk,weiyirong/crosswalk-1,alex-zhang/crosswalk,bestwpw/crosswalk,tomatell/crosswalk,tedshroyer/crosswalk,stonegithubs/crosswalk,Bysmyyr/crosswalk,weiyirong/crosswalk-1,darktears/crosswalk,darktears/crosswalk,XiaosongWei/crosswalk,minggangw/crosswalk,tedshroyer/crosswalk,jpike88/crosswalk,PeterWangIntel/crosswalk,jondong/crosswalk,hgl888/crosswalk,amaniak/crosswalk,darktears/crosswalk,chinakids/crosswalk,XiaosongWei/crosswalk,siovene/crosswalk,chuan9/crosswalk,DonnaWuDongxia/crosswalk,crosswalk-project/crosswalk-efl,pk-sam/crosswalk,jondong/crosswalk,XiaosongWei/crosswalk,jpike88/crosswalk,RafuCater/crosswalk,tedshroyer/crosswalk,jondong/crosswalk,siovene/crosswalk,chinakids/crosswalk,xzhan96/crosswalk,axinging/crosswalk,zliang7/crosswalk,Bysmyyr/crosswalk,Bysmyyr/crosswalk