Fix Polymer licensing issues

third_party/web-animations-js/sources/src/apply.js

-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-//     You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-//     See the License for the specific language governing permissions and
-// limitations under the License.
-
-(function(scope, testing) {
-
-  scope.apply = function(element, property, value) {
-    element.style[scope.propertyName(property)] = value;
-  };
-
-  scope.clear = function(element, property) {
-    element.style[scope.propertyName(property)] = '';
-  };
-
-})(webAnimations1, webAnimationsTesting);