code: public void removeCollider(GVRCollider collider)
      {
          mGroup.removeChild(collider);
          NativeComponent.removeChildComponent(getNative(), collider.getNative());
      }
docs: Remove a {@link GVRCollider} from this collider-group.
  
  No exception is thrown if the collider is not held by this collider-group.
  
  @param collider The {@link GVRCollider} to remove