AudioListener: Removed call to listener.setVelocity.

https://github.com/WebAudio/web-audio-api/issues/372

src/extras/audio/AudioListener.js

@@ -22,9 +22,6 @@ THREE.AudioListener.prototype.updateMatrixWorld = ( function () {
 	var scale = new THREE.Vector3();
 
 	var orientation = new THREE.Vector3();
-	var velocity = new THREE.Vector3();
-
-	var positionPrev = new THREE.Vector3();
 
 	return function ( force ) {
 
@@ -36,13 +33,9 @@ THREE.AudioListener.prototype.updateMatrixWorld = ( function () {
 		this.matrixWorld.decompose( position, quaternion, scale );
 
 		orientation.set( 0, 0, -1 ).applyQuaternion( quaternion );
-		velocity.subVectors( position, positionPrev );
 
 		listener.setPosition( position.x, position.y, position.z );
 		listener.setOrientation( orientation.x, orientation.y, orientation.z, up.x, up.y, up.z );
-		listener.setVelocity( velocity.x, velocity.y, velocity.z );
-
-		positionPrev.copy( position );
 
 	};