Enable Web GL on Safari4

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MacOS X 10.6's Safari 4  enable Web GL
http://kheresy.wordpress.com/2010/04/01/webgl-%E7%B0%A1%E4%BB%8B%E3%80%81%E4%BB%A5%E5%8F%8A%E7%9B%AE%E5%89%8D%E7%9A%84%E7%80%8F%E8%A6%BD%E5%99%A8/

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