Fix Polymer licensing issues

third_party/web-animations-js/sources/src/font-weight-handler.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) {
-  function parse(string) {
-    var out = Number(string);
-    if (isNaN(out) || out < 100 || out > 900 || out % 100 !== 0) {
-      return;
-    }
-    return out;
-  }
-
-  function toCss(value) {
-    value = Math.round(value / 100) * 100;
-    value = scope.clamp(100, 900, value);
-    if (value === 400) {
-      return 'normal';
-    }
-    if (value === 700) {
-      return 'bold';
-    }
-    return String(value);
-  }
-
-  function merge(left, right) {
-    return [left, right, toCss];
-  }
-
-  scope.addPropertiesHandler(parse, merge, ['font-weight']);
-
-})(webAnimations1);