Version 3.27.34.7 (merged r22223)

Remove a bunch of Isolate::UncheckedCurrent calls

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/412513003

git-svn-id: https://v8.googlecode.com/svn/branches/3.27@22555 ce2b1a6d-e550-0410-aec6-3dcde31c8c00