Revert 55065 - Update V8 to version 2.3.5.1

Looks as if this causes consistent failure of unit_tests/TestActivate on Mac 10.6.

TBR=sgjesse@google.com
Review URL: http://codereview.chromium.org/3051036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55078 0039d316-1c4b-4281-b951-d872f2087c98