removed chrome frame option from meta tag

Google has discontinue the Chrome frame project so I suggest to remove it. Event HTML5 boilerplate has removed it https://github.com/h5bp/html5-boilerplate/commit/8fc26501f4635df92bbbff966d8d6e6064e0e419
Merge pull request #62 from jitendravyas/patch-1

removed chrome frame option from meta tag