remove Isolate::Current from most files starting with 'f' through 'i'

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23886002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16506 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
remove Isolate::Current from most files starting with 's' through 'v'

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23549011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16507 ce2b1a6d-e550-0410-aec6-3dcde31c8c00