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This is to later on allow targets to pick at link time if to include the external or internal implementation. In order to do that the video_engine cannot compile different based on which option is picked later on. BUG=3768,3770 R=glaznev@webrtc.org, stefan@webrtc.org TBR=henrike@webrtc.org, mflodman@webrtc.org Review URL: https://webrtc-codereview.appspot.com/25529004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7208 4adac7df-926f-26a2-2b94-8c16560cd09d