[Android] Remove unused build target xwalk_runtime_lib_apk_extension.
[Android] Remove unused build target xwalk_runtime_lib_apk_extension.

Since the js_api folder in assets is removed, the build target will not be
used any more.

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