Fix `postMessage` not working for windows opened by `window.open`
Fix `postMessage` not working for windows opened by `window.open`

tinydew4/electron,twolfson/electron,joaomoreno/atom-shell,arturts/electron,thompsonemerson/electron,jaanus/electron,bpasero/electron,gabriel/electron,kcrt/electron,simongregory/electron,gerhardberger/electron,lzpfmh/electron,tylergibson/electron,seanchas116/electron,simongregory/electron,jaanus/electron,miniak/electron,IonicaBizauKitchen/electron,jaanus/electron,felixrieseberg/electron,thomsonreuters/electron,ankitaggarwal011/electron,joaomoreno/atom-shell,seanchas116/electron,jaanus/electron,leftstick/electron,thomsonreuters/electron,nekuz0r/electron,brenca/electron,pombredanne/electron,thomsonreuters/electron,dongjoon-hyun/electron,ankitaggarwal011/electron,Gerhut/electron,arturts/electron,preco21/electron,preco21/electron,joaomoreno/atom-shell,lzpfmh/electron,dongjoon-hyun/electron,ankitaggarwal011/electron,Evercoder/electron,deed02392/electron,tonyganch/electron,thingsinjars/electron,posix4e/electron,pombredanne/electron,arturts/electron,miniak/electron,tonyganch/electron,matiasinsaurralde/electron,deed02392/electron,biblerule/UMCTelnetHub,brenca/electron,brave/electron,tonyganch/electron,deed02392/electron,astoilkov/electron,meowlab/electron,shiftkey/electron,biblerule/UMCTelnetHub,noikiy/electron,roadev/electron,thingsinjars/electron,dongjoon-hyun/electron,preco21/electron,deed02392/electron,twolfson/electron,astoilkov/electron,tylergibson/electron,meowlab/electron,leftstick/electron,leftstick/electron,etiktin/electron,astoilkov/electron,kokdemo/electron,voidbridge/electron,tylergibson/electron,the-ress/electron,evgenyzinoviev/electron,gabriel/electron,pombredanne/electron,MaxWhere/electron,aichingm/electron,brave/electron,jhen0409/electron,matiasinsaurralde/electron,gabriel/electron,lzpfmh/electron,evgenyzinoviev/electron,aliib/electron,minggo/electron,rajatsingla28/electron,thompsonemerson/electron,lzpfmh/electron,brenca/electron,brave/muon,matiasinsaurralde/electron,kokdemo/electron,the-ress/electron,mjaniszew/electron,shiftkey/electron,mjaniszew/electron,Gerhut/electron,shiftkey/electron,brenca/electron,stevekinney/electron,aliib/electron,pombredanne/electron,seanchas116/electron,tinydew4/electron,nekuz0r/electron,simongregory/electron,wan-qy/electron,IonicaBizauKitchen/electron,the-ress/electron,mjaniszew/electron,electron/electron,voidbridge/electron,rajatsingla28/electron,shiftkey/electron,wan-qy/electron,astoilkov/electron,simongregory/electron,roadev/electron,bpasero/electron,nekuz0r/electron,meowlab/electron,thompsonemerson/electron,Evercoder/electron,astoilkov/electron,rreimann/electron,Evercoder/electron,rajatsingla28/electron,tonyganch/electron,jaanus/electron,ankitaggarwal011/electron,gerhardberger/electron,posix4e/electron,thompsonemerson/electron,Gerhut/electron,arturts/electron,jhen0409/electron,wan-qy/electron,bbondy/electron,rreimann/electron,Gerhut/electron,renaesop/electron,aliib/electron,felixrieseberg/electron,MaxWhere/electron,leethomas/electron,felixrieseberg/electron,leftstick/electron,matiasinsaurralde/electron,brave/electron,electron/electron,tinydew4/electron,brave/muon,bbondy/electron,felixrieseberg/electron,twolfson/electron,bbondy/electron,kokdemo/electron,noikiy/electron,roadev/electron,wan-qy/electron,bpasero/electron,bpasero/electron,aliib/electron,gabriel/electron,rajatsingla28/electron,meowlab/electron,miniak/electron,leethomas/electron,IonicaBizauKitchen/electron,ankitaggarwal011/electron,felixrieseberg/electron,roadev/electron,thingsinjars/electron,lzpfmh/electron,brenca/electron,IonicaBizauKitchen/electron,nekuz0r/electron,MaxWhere/electron,brave/muon,pombredanne/electron,etiktin/electron,stevekinney/electron,thompsonemerson/electron,aliib/electron,electron/electron,rreimann/electron,evgenyzinoviev/electron,tylergibson/electron,leftstick/electron,matiasinsaurralde/electron,matiasinsaurralde/electron,meowlab/electron,minggo/electron,Floato/electron,miniak/electron,Floato/electron,bpasero/electron,thomsonreuters/electron,electron/electron,gerhardberger/electron,leethomas/electron,mjaniszew/electron,Floato/electron,MaxWhere/electron,Evercoder/electron,dongjoon-hyun/electron,jaanus/electron,rajatsingla28/electron,Floato/electron,voidbridge/electron,biblerule/UMCTelnetHub,shiftkey/electron,preco21/electron,leftstick/electron,noikiy/electron,shiftkey/electron,nekuz0r/electron,etiktin/electron,IonicaBizauKitchen/electron,tinydew4/electron,rreimann/electron,aichingm/electron,MaxWhere/electron,the-ress/electron,biblerule/UMCTelnetHub,twolfson/electron,dongjoon-hyun/electron,kcrt/electron,IonicaBizauKitchen/electron,etiktin/electron,tinydew4/electron,rajatsingla28/electron,brave/muon,the-ress/electron,kokdemo/electron,tylergibson/electron,renaesop/electron,seanchas116/electron,joaomoreno/atom-shell,stevekinney/electron,lzpfmh/electron,roadev/electron,minggo/electron,gerhardberger/electron,evgenyzinoviev/electron,bbondy/electron,twolfson/electron,thomsonreuters/electron,rreimann/electron,gabriel/electron,brave/electron,leethomas/electron,MaxWhere/electron,nekuz0r/electron,bpasero/electron,evgenyzinoviev/electron,kokdemo/electron,jhen0409/electron,mjaniszew/electron,aichingm/electron,voidbridge/electron,leethomas/electron,kcrt/electron,gerhardberger/electron,Gerhut/electron,tylergibson/electron,thingsinjars/electron,kcrt/electron,Evercoder/electron,stevekinney/electron,biblerule/UMCTelnetHub,brave/electron,biblerule/UMCTelnetHub,leethomas/electron,etiktin/electron,tinydew4/electron,brenca/electron,miniak/electron,brave/electron,renaesop/electron,wan-qy/electron,jhen0409/electron,renaesop/electron,electron/electron,simongregory/electron,deed02392/electron,Floato/electron,gerhardberger/electron,seanchas116/electron,posix4e/electron,thompsonemerson/electron,meowlab/electron,joaomoreno/atom-shell,jhen0409/electron,aichingm/electron,seanchas116/electron,kokdemo/electron,tonyganch/electron,aliib/electron,mjaniszew/electron,stevekinney/electron,Floato/electron,gabriel/electron,evgenyzinoviev/electron,noikiy/electron,jhen0409/electron,minggo/electron,preco21/electron,noikiy/electron,etiktin/electron,noikiy/electron,brave/muon,thomsonreuters/electron,electron/electron,Evercoder/electron,aichingm/electron,bbondy/electron,simongregory/electron,ankitaggarwal011/electron,twolfson/electron,voidbridge/electron,gerhardberger/electron,tonyganch/electron,posix4e/electron,rreimann/electron,kcrt/electron,joaomoreno/atom-shell,posix4e/electron,kcrt/electron,dongjoon-hyun/electron,electron/electron,pombredanne/electron,wan-qy/electron,renaesop/electron,preco21/electron,roadev/electron,arturts/electron,Gerhut/electron,deed02392/electron,thingsinjars/electron,stevekinney/electron,aichingm/electron,renaesop/electron,bpasero/electron,the-ress/electron,minggo/electron,astoilkov/electron,the-ress/electron,voidbridge/electron,felixrieseberg/electron,miniak/electron,bbondy/electron,thingsinjars/electron,posix4e/electron,brave/muon,minggo/electron,arturts/electron