Revert change r3004, issue http://codereview.chromium.org/244022, because Linux 64-bit Chrome crashes with more than 10 tabs.  Linux may not like 10 processes, each reserving 2 GB of virtual address space.
Review URL: http://codereview.chromium.org/246064

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3006 ce2b1a6d-e550-0410-aec6-3dcde31c8c00