Remove the 'webrtc_test_video_render_dependencies' target.

This target is no longer needed and is causing linking errors on XCode.

R=andresp@webrtc.org, pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/28519004

Patch from Alexandre Gouaillard <agouaillard@gmail.com>.

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7226 4adac7df-926f-26a2-2b94-8c16560cd09d