Revert v8 update to version 1.2.3.  This update seems to introduce new crashes in layout tests.  
Revert v8 update to version 1.2.3.  This update seems to introduce new
crashes in layout tests.  

TBR=erik.corry@gmail.com
Review URL: http://codereview.chromium.org/115205

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@15794 0039d316-1c4b-4281-b951-d872f2087c98

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