uncacheAction( clip, optionalRoot ) {

		const action = this.existingAction( clip, optionalRoot );

		if ( action !== null ) {

			this._deactivateAction( action );
			this._removeInactiveAction( action );

		}

	}
Deallocates all memory resources for an action. The action is identified by the
given clip and an optional root object. Before using this method make
sure to call {@link AnimationAction#stop} to deactivate the action.

@param {AnimationClip|string} clip - An animation clip or alternatively the name of the animation clip.
@param {Object3D} [optionalRoot] - An alternative root object.