misc/goplay: fix Tab and Shift+Enter in Firefox.
misc/goplay: fix Tab and Shift+Enter in Firefox.

Fixes issue 1633.

R=adg, dsymonds
CC=golang-dev
http://codereview.appspot.com/4439042

Committer: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

mhennings/marcohennings-go,Triskite/willstone-goclone,mhennings/marcohennings-go,mhennings/marcohennings-go,Triskite/willstone-goclone,webfd/go-zh,scirelli/scirelli-go,Triskite/willstone-goclone,npe9/noahevans-go9,d0f/go-zh,rdp/rogerpack2005-golang,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,bryanxu/go-zh,Triskite/willstone-goclone,d0f/go-zh,scirelli/scirelli-go,webfd/go-zh,rdp/rogerpack2005-golang,mhennings/marcohennings-go,rflanagan/reginaldflanagan-project1,bryanxu/go-zh,mhennings/marcohennings-go,d0f/go-zh,rdp/rogerpack2005-golang,rdp/rogerpack2005-golang,webfd/go-zh,mhennings/marcohennings-go,webfd/go-zh,sanjosh/sanjos100-tipc,npe9/noahevans-go9,Triskite/willstone-goclone,npe9/noahevans-go9,glycerine/jeaten-go-arrayof-structof,glycerine/jeaten-go-arrayof-structof,npe9/noahevans-go9,Triskite/willstone-goclone,webfd/go-zh,rflanagan/reginaldflanagan-project1,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,glycerine/jeaten-go-arrayof-structof,npe9/noahevans-go9,scirelli/scirelli-go,webfd/go-zh,scirelli/scirelli-go,scirelli/scirelli-go,npe9/noahevans-go9,bryanxu/go-zh,rflanagan/reginaldflanagan-project1,d0f/go-zh,scirelli/scirelli-go,rflanagan/reginaldflanagan-project1,d0f/go-zh,rdp/rogerpack2005-golang,d0f/go-zh,rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,glycerine/jeaten-go-arrayof-structof,webfd/go-zh,bryanxu/go-zh,sanjosh/sanjos100-tipc,rdp/rogerpack2005-golang,Triskite/willstone-goclone,glycerine/jeaten-go-arrayof-structof,scirelli/scirelli-go,d0f/go-zh,glycerine/jeaten-go-arrayof-structof,bryanxu/go-zh,rflanagan/reginaldflanagan-project1,sanjosh/sanjos100-tipc,sanjosh/sanjos100-tipc,bryanxu/go-zh,npe9/noahevans-go9,rflanagan/reginaldflanagan-project1,npe9/noahevans-go9,scirelli/scirelli-go,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,d0f/go-zh,webfd/go-zh,sanjosh/sanjos100-tipc,bryanxu/go-zh,rdp/rogerpack2005-golang,sanjosh/sanjos100-tipc,bryanxu/go-zh