Rollback of r12868, r12849 in trunk branch. (issue 11366132)

[sven...@chromium.org]

Reviewers: Toon Verwaest,

Description:
Rollback of r12868, r12849 in trunk branch.

Fixed visibility attribute for GetPointerFromInternalField

Heavy cleanup of the external pointer API.

R=verw...@chromium.org
BUG=Chrome 159674


Please review this at https://codereview.chromium.org/11366132/

SVN Base: https://v8.googlecode.com/svn/trunk

Affected files:
M include/v8.h
M src/api.h
M src/api.cc
M src/bootstrapper.cc
M src/compiler.cc
M src/contexts.h
M src/factory.h
M src/factory.cc
M src/heap.h
M src/heap.cc
M src/objects-inl.h
M src/objects.h
M src/profile-generator.cc
M src/version.cc
M test/cctest/test-api.cc
M test/cctest/test-debug.cc
M test/cctest/test-decls.cc
M tools/grokdump.py

[verw...@chromium.org]

lgtm

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