Widget Interface - getItem() must return null if there is no item
Widget Interface - getItem() must return null if there is no item

Spec: http://dev.w3.org/html5/webstorage/#dom-storage-getitem

BUG=XWALK-2777

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