ca8b3a387eeb7f7c320d786b2a040e27bb2ed5cd

Review URL: http://webrtc-codereview.appspot.com/242003 git-svn-id: http://webrtc.googlecode.com/svn/trunk@793 4adac7df-926f-26a2-2b94-8c16560cd09d
kind() method in track interface is changed to std::string to keep uniformity with other get methods
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