Revert change 4812 due to performance problems.  This was a change in string addition on ia32. Review URL: http://codereview.chromium.org/2706001
Revert change 4812 due to performance problems.  This was a change in string addition on ia32.
Review URL: http://codereview.chromium.org/2706001

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@4813 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh