Version 3.28.32 (based on bleeding_edge revision r22528)

Update ICU to 5.2 (matching chromium) (issue 3452).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@22537 ce2b1a6d-e550-0410-aec6-3dcde31c8c00