thread isolate in PreallocatedStorageAllocationPolicy

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23479015

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16467 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
revert thread isolate in PreallocatedStorageAllocationPolicy

This reverts 16467 for breaking windows build

TBR=svenpanne@chromium.org

BUG=

Review URL: https://codereview.chromium.org/23824005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16468 ce2b1a6d-e550-0410-aec6-3dcde31c8c00