vp9 svc: Move CheckLayerRateTargeting into class.
vp9 svc: Move CheckLayerRateTargeting into class.

No need to pass arguments that are already members of the class.

Change-Id: I887d33d6037b561dee5dd8d49bb112d9120cd2a7

webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx