Revert revision 73986 - Update of V8 to version 3.1.2
Revert revision 73986 - Update of V8 to version 3.1.2

This updated caused us to hit an assert in V8:
http://build.chromium.org/p/chromium/builders/Linux%20Tests%20(dbg-shlib)/builds/2767/steps/test_shell_tests/logs/stdio



Review URL: http://codereview.chromium.org/6250194

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@73989 0039d316-1c4b-4281-b951-d872f2087c98

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