Removed unused code.
Removed unused code.

jackwadden/VASim,Jinglei-Cheng-THU/VASim,Jinglei-Cheng-THU/VASim,jackwadden/VASim,jackwadden/VASim,Jinglei-Cheng-THU/VASim,Jinglei-Cheng-THU/VASim,jackwadden/VASim