Remove workaround for Linux credential-passing bug
A=Jed Davis <jld@mozilla.com> R=ted at https://breakpad.appspot.com/7724002/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1389 4c0a9323-5329-0410-9bdc-e9ce6186880e
Linux multiprocess crash reporter: use pipe instead of socketpair in the client
A=Jed Davis <jld@mozilla.com> R=ted at https://breakpad.appspot.com/1724002/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1390 4c0a9323-5329-0410-9bdc-e9ce6186880e