code: function removeDefaultCamera (sceneEl) {
    var defaultCamera;
    var camera = sceneEl.camera;
    if (!camera) { return; }
  
    // Remove default camera if present.
    defaultCamera = sceneEl.querySelector('[' + DEFAULT_CAMERA_ATTR + ']');
    if (!defaultCamera) { return; }
    sceneEl.removeChild(defaultCamera);
  }
docs: Remove injected default camera from scene, if present.
  
  @param {Element} sceneEl