Remove empty copy functions from Line2 and LineSegments2

examples/js/lines/Line2.js

@@ -18,14 +18,6 @@ THREE.Line2.prototype = Object.assign( Object.create( THREE.LineSegments2.protot
 
 	constructor: THREE.Line2,
 
-	isLine2: true,
-
-	copy: function ( /* source */ ) {
-
-		// todo
-
-		return this;
-
-	}
+	isLine2: true
 
 } );

examples/js/lines/LineSegments2.js

@@ -52,14 +52,6 @@ THREE.LineSegments2.prototype = Object.assign( Object.create( THREE.Mesh.prototy
 
 		};
 
-	}() ),
-
-	copy: function ( /* source */ ) {
-
-		// todo
-
-		return this;
-
-	}
+	}() )
 
 } );