Rollback of r12868, r12849 in trunk branch.

Fixed visibility attribute for GetPointerFromInternalField

Heavy cleanup of the external pointer API.

R=verwaest@chromium.org
BUG=Chrome 159674

Review URL: https://codereview.chromium.org/11366132

git-svn-id: http://v8.googlecode.com/svn/trunk@12878 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
18 files changed