Fix version.cc on trunk.

git-svn-id: https://v8.googlecode.com/svn/trunk@21854 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Version 3.27.31 (based on bleeding_edge revision r21851)

Version fix.

git-svn-id: https://v8.googlecode.com/svn/trunk@21855 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/trunk' into trunk