Fix compilation error with -Werror=delete-non-virtual-dtor flag set
Fix compilation error with -Werror=delete-non-virtual-dtor flag set

Added a virtual destructor to the local RunAsBrowser() 'Observer' class (even though it is not needed there) so that compiler does not complain.

chuan9/crosswalk,shaochangbin/crosswalk,crosswalk-project/crosswalk,weiyirong/crosswalk-1,DonnaWuDongxia/crosswalk,leonhsl/crosswalk,mrunalk/crosswalk,Bysmyyr/crosswalk,Pluto-tv/crosswalk,hgl888/crosswalk,baleboy/crosswalk,bestwpw/crosswalk,Bysmyyr/crosswalk,jondwillis/crosswalk,bestwpw/crosswalk,rakuco/crosswalk,PeterWangIntel/crosswalk,pk-sam/crosswalk,zliang7/crosswalk,minggangw/crosswalk,PeterWangIntel/crosswalk,axinging/crosswalk,zeropool/crosswalk,leonhsl/crosswalk,ZhengXinCN/crosswalk,baleboy/crosswalk,dreamsxin/crosswalk,baleboy/crosswalk,chinakids/crosswalk,lincsoon/crosswalk,mrunalk/crosswalk,hgl888/crosswalk-efl,heke123/crosswalk,hgl888/crosswalk,crosswalk-project/crosswalk,rakuco/crosswalk,shaochangbin/crosswalk,ZhengXinCN/crosswalk,chinakids/crosswalk,marcuspridham/crosswalk,alex-zhang/crosswalk,myroot/crosswalk,zeropool/crosswalk,lincsoon/crosswalk,TheDirtyCalvinist/spacewalk,shaochangbin/crosswalk,darktears/crosswalk,shaochangbin/crosswalk,amaniak/crosswalk,DonnaWuDongxia/crosswalk,marcuspridham/crosswalk,xzhan96/crosswalk,heke123/crosswalk,siovene/crosswalk,tomatell/crosswalk,axinging/crosswalk,stonegithubs/crosswalk,tedshroyer/crosswalk,minggangw/crosswalk,pk-sam/crosswalk,jondong/crosswalk,tedshroyer/crosswalk,hgl888/crosswalk-efl,tedshroyer/crosswalk,Bysmyyr/crosswalk,XiaosongWei/crosswalk,zliang7/crosswalk,zliang7/crosswalk,chuan9/crosswalk,huningxin/crosswalk,XiaosongWei/crosswalk,alex-zhang/crosswalk,jpike88/crosswalk,marcuspridham/crosswalk,jpike88/crosswalk,lincsoon/crosswalk,alex-zhang/crosswalk,XiaosongWei/crosswalk,chuan9/crosswalk,leonhsl/crosswalk,huningxin/crosswalk,Pluto-tv/crosswalk,jondwillis/crosswalk,weiyirong/crosswalk-1,XiaosongWei/crosswalk,alex-zhang/crosswalk,RafuCater/crosswalk,jondong/crosswalk,xzhan96/crosswalk,jpike88/crosswalk,siovene/crosswalk,baleboy/crosswalk,chinakids/crosswalk,lincsoon/crosswalk,pk-sam/crosswalk,minggangw/crosswalk,xzhan96/crosswalk,Pluto-tv/crosswalk,amaniak/crosswalk,jondong/crosswalk,minggangw/crosswalk,minggangw/crosswalk,darktears/crosswalk,darktears/crosswalk,fujunwei/crosswalk,axinging/crosswalk,stonegithubs/crosswalk,mrunalk/crosswalk,lincsoon/crosswalk,jpike88/crosswalk,myroot/crosswalk,crosswalk-project/crosswalk,jpike88/crosswalk,jondong/crosswalk,hgl888/crosswalk-efl,leonhsl/crosswalk,ZhengXinCN/crosswalk,ZhengXinCN/crosswalk,qjia7/crosswalk,tedshroyer/crosswalk,DonnaWuDongxia/crosswalk,tomatell/crosswalk,amaniak/crosswalk,crosswalk-project/crosswalk,fujunwei/crosswalk,jondwillis/crosswalk,dreamsxin/crosswalk,myroot/crosswalk,axinging/crosswalk,baleboy/crosswalk,axinging/crosswalk,crosswalk-project/crosswalk-efl,bestwpw/crosswalk,dreamsxin/crosswalk,rakuco/crosswalk,huningxin/crosswalk,DonnaWuDongxia/crosswalk,heke123/crosswalk,darktears/crosswalk,stonegithubs/crosswalk,DonnaWuDongxia/crosswalk,crosswalk-project/crosswalk,hgl888/crosswalk-efl,XiaosongWei/crosswalk,chuan9/crosswalk,rakuco/crosswalk,siovene/crosswalk,zeropool/crosswalk,xzhan96/crosswalk,dreamsxin/crosswalk,tomatell/crosswalk,rakuco/crosswalk,baleboy/crosswalk,Bysmyyr/crosswalk,RafuCater/crosswalk,marcuspridham/crosswalk,ZhengXinCN/crosswalk,zeropool/crosswalk,rakuco/crosswalk,Pluto-tv/crosswalk,weiyirong/crosswalk-1,fujunwei/crosswalk,DonnaWuDongxia/crosswalk,weiyirong/crosswalk-1,lincsoon/crosswalk,dreamsxin/crosswalk,pk-sam/crosswalk,pk-sam/crosswalk,siovene/crosswalk,RafuCater/crosswalk,XiaosongWei/crosswalk,PeterWangIntel/crosswalk,huningxin/crosswalk,amaniak/crosswalk,alex-zhang/crosswalk,PeterWangIntel/crosswalk,qjia7/crosswalk,TheDirtyCalvinist/spacewalk,dreamsxin/crosswalk,hgl888/crosswalk,huningxin/crosswalk,XiaosongWei/crosswalk,jpike88/crosswalk,crosswalk-project/crosswalk,alex-zhang/crosswalk,amaniak/crosswalk,weiyirong/crosswalk-1,ZhengXinCN/crosswalk,zliang7/crosswalk,minggangw/crosswalk,Bysmyyr/crosswalk,shaochangbin/crosswalk,jondong/crosswalk,heke123/crosswalk,Pluto-tv/crosswalk,tomatell/crosswalk,PeterWangIntel/crosswalk,chuan9/crosswalk,dreamsxin/crosswalk,amaniak/crosswalk,lincsoon/crosswalk,darktears/crosswalk,fujunwei/crosswalk,marcuspridham/crosswalk,axinging/crosswalk,heke123/crosswalk,siovene/crosswalk,tedshroyer/crosswalk,weiyirong/crosswalk-1,stonegithubs/crosswalk,hgl888/crosswalk-efl,fujunwei/crosswalk,baleboy/crosswalk,heke123/crosswalk,crosswalk-project/crosswalk-efl,chinakids/crosswalk,mrunalk/crosswalk,hgl888/crosswalk,jondwillis/crosswalk,tomatell/crosswalk,Bysmyyr/crosswalk,darktears/crosswalk,shaochangbin/crosswalk,crosswalk-project/crosswalk-efl,xzhan96/crosswalk,TheDirtyCalvinist/spacewalk,leonhsl/crosswalk,zeropool/crosswalk,jondwillis/crosswalk,RafuCater/crosswalk,mrunalk/crosswalk,qjia7/crosswalk,chuan9/crosswalk,leonhsl/crosswalk,rakuco/crosswalk,alex-zhang/crosswalk,qjia7/crosswalk,TheDirtyCalvinist/spacewalk,minggangw/crosswalk,crosswalk-project/crosswalk,heke123/crosswalk,myroot/crosswalk,Bysmyyr/crosswalk,zeropool/crosswalk,xzhan96/crosswalk,stonegithubs/crosswalk,amaniak/crosswalk,RafuCater/crosswalk,Pluto-tv/crosswalk,hgl888/crosswalk-efl,jondwillis/crosswalk,DonnaWuDongxia/crosswalk,minggangw/crosswalk,crosswalk-project/crosswalk,chinakids/crosswalk,hgl888/crosswalk,rakuco/crosswalk,darktears/crosswalk,TheDirtyCalvinist/spacewalk,mrunalk/crosswalk,RafuCater/crosswalk,jondong/crosswalk,bestwpw/crosswalk,crosswalk-project/crosswalk-efl,tomatell/crosswalk,chinakids/crosswalk,chuan9/crosswalk,zliang7/crosswalk,qjia7/crosswalk,leonhsl/crosswalk,zliang7/crosswalk,crosswalk-project/crosswalk-efl,stonegithubs/crosswalk,marcuspridham/crosswalk,bestwpw/crosswalk,fujunwei/crosswalk,Bysmyyr/crosswalk,hgl888/crosswalk,jondong/crosswalk,crosswalk-project/crosswalk-efl,lincsoon/crosswalk,tomatell/crosswalk,pk-sam/crosswalk,PeterWangIntel/crosswalk,crosswalk-project/crosswalk-efl,jpike88/crosswalk,ZhengXinCN/crosswalk,siovene/crosswalk,pk-sam/crosswalk,myroot/crosswalk,PeterWangIntel/crosswalk,darktears/crosswalk,tedshroyer/crosswalk,xzhan96/crosswalk,TheDirtyCalvinist/spacewalk,bestwpw/crosswalk,weiyirong/crosswalk-1,huningxin/crosswalk,marcuspridham/crosswalk,Pluto-tv/crosswalk,siovene/crosswalk,hgl888/crosswalk,qjia7/crosswalk,hgl888/crosswalk-efl,bestwpw/crosswalk,fujunwei/crosswalk,xzhan96/crosswalk,axinging/crosswalk,jondong/crosswalk,jondwillis/crosswalk,tedshroyer/crosswalk,myroot/crosswalk,marcuspridham/crosswalk,zliang7/crosswalk,baleboy/crosswalk,zeropool/crosswalk,stonegithubs/crosswalk,hgl888/crosswalk,heke123/crosswalk,RafuCater/crosswalk,zliang7/crosswalk