gyp: Use repack_action.gypi.
gyp: Use repack_action.gypi.

With M45, we can use upstream's newly-introduced repack_action.gypi to
simplify our work: it takes care of all the inputs/action/output
boilerplate.

Upstream CL: https://codereview.chromium.org/216013003

hgl888/crosswalk,zliang7/crosswalk,RafuCater/crosswalk,jondong/crosswalk,xzhan96/crosswalk,rakuco/crosswalk,marcuspridham/crosswalk,zeropool/crosswalk,marcuspridham/crosswalk,PeterWangIntel/crosswalk,PeterWangIntel/crosswalk,darktears/crosswalk,marcuspridham/crosswalk,marcuspridham/crosswalk,jondong/crosswalk,crosswalk-project/crosswalk,Bysmyyr/crosswalk,RafuCater/crosswalk,hgl888/crosswalk,lincsoon/crosswalk,xzhan96/crosswalk,tedshroyer/crosswalk,chuan9/crosswalk,RafuCater/crosswalk,marcuspridham/crosswalk,tedshroyer/crosswalk,crosswalk-project/crosswalk,minggangw/crosswalk,chuan9/crosswalk,marcuspridham/crosswalk,heke123/crosswalk,zliang7/crosswalk,RafuCater/crosswalk,Bysmyyr/crosswalk,heke123/crosswalk,zeropool/crosswalk,baleboy/crosswalk,RafuCater/crosswalk,marcuspridham/crosswalk,bestwpw/crosswalk,darktears/crosswalk,Bysmyyr/crosswalk,dreamsxin/crosswalk,Bysmyyr/crosswalk,xzhan96/crosswalk,rakuco/crosswalk,axinging/crosswalk,zliang7/crosswalk,jondong/crosswalk,heke123/crosswalk,zeropool/crosswalk,zliang7/crosswalk,weiyirong/crosswalk-1,baleboy/crosswalk,RafuCater/crosswalk,axinging/crosswalk,dreamsxin/crosswalk,chuan9/crosswalk,lincsoon/crosswalk,zeropool/crosswalk,minggangw/crosswalk,bestwpw/crosswalk,hgl888/crosswalk,jondong/crosswalk,rakuco/crosswalk,xzhan96/crosswalk,hgl888/crosswalk,xzhan96/crosswalk,darktears/crosswalk,chuan9/crosswalk,zliang7/crosswalk,bestwpw/crosswalk,axinging/crosswalk,jondong/crosswalk,hgl888/crosswalk,PeterWangIntel/crosswalk,crosswalk-project/crosswalk,jondong/crosswalk,bestwpw/crosswalk,xzhan96/crosswalk,darktears/crosswalk,weiyirong/crosswalk-1,rakuco/crosswalk,chuan9/crosswalk,baleboy/crosswalk,lincsoon/crosswalk,PeterWangIntel/crosswalk,heke123/crosswalk,dreamsxin/crosswalk,rakuco/crosswalk,RafuCater/crosswalk,PeterWangIntel/crosswalk,hgl888/crosswalk,rakuco/crosswalk,Bysmyyr/crosswalk,crosswalk-project/crosswalk,hgl888/crosswalk,heke123/crosswalk,baleboy/crosswalk,axinging/crosswalk,hgl888/crosswalk,PeterWangIntel/crosswalk,dreamsxin/crosswalk,tedshroyer/crosswalk,zliang7/crosswalk,lincsoon/crosswalk,minggangw/crosswalk,axinging/crosswalk,darktears/crosswalk,minggangw/crosswalk,tedshroyer/crosswalk,heke123/crosswalk,chuan9/crosswalk,axinging/crosswalk,tedshroyer/crosswalk,weiyirong/crosswalk-1,bestwpw/crosswalk,tedshroyer/crosswalk,marcuspridham/crosswalk,xzhan96/crosswalk,bestwpw/crosswalk,crosswalk-project/crosswalk,darktears/crosswalk,axinging/crosswalk,weiyirong/crosswalk-1,zliang7/crosswalk,baleboy/crosswalk,crosswalk-project/crosswalk,lincsoon/crosswalk,lincsoon/crosswalk,lincsoon/crosswalk,chuan9/crosswalk,zeropool/crosswalk,tedshroyer/crosswalk,Bysmyyr/crosswalk,dreamsxin/crosswalk,baleboy/crosswalk,crosswalk-project/crosswalk,weiyirong/crosswalk-1,jondong/crosswalk,minggangw/crosswalk,bestwpw/crosswalk,darktears/crosswalk,crosswalk-project/crosswalk,baleboy/crosswalk,rakuco/crosswalk,heke123/crosswalk,weiyirong/crosswalk-1,minggangw/crosswalk,heke123/crosswalk,weiyirong/crosswalk-1,PeterWangIntel/crosswalk,zeropool/crosswalk,rakuco/crosswalk,jondong/crosswalk,minggangw/crosswalk,zeropool/crosswalk,lincsoon/crosswalk,xzhan96/crosswalk,Bysmyyr/crosswalk,dreamsxin/crosswalk,dreamsxin/crosswalk,zliang7/crosswalk,baleboy/crosswalk,darktears/crosswalk,Bysmyyr/crosswalk,minggangw/crosswalk