regex: Remove unneeded imports from test.
regex: Remove unneeded imports from test.

R=rsc, adg, r
CC=golang-dev
http://codereview.appspot.com/264041

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

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