Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/neon-animation/neon-animation-behavior.html

-<!--
-@license
-Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
--->
-
-<link rel="import" href="../polymer/polymer.html">
-<link rel="import" href="../iron-meta/iron-meta.html">
-
-<script>
-
-  /**
-   * Use `Polymer.NeonAnimationBehavior` to implement an animation.
-   * @polymerBehavior
-   */
-  Polymer.NeonAnimationBehavior = {
-
-    properties: {
-
-      /**
-       * Defines the animation timing.
-       */
-      animationTiming: {
-        type: Object,
-        value: function() {
-          return {
-            duration: 500,
-            easing: 'cubic-bezier(0.4, 0, 0.2, 1)',
-            fill: 'both'
-          }
-        }
-      }
-
-    },
-
-    registered: function() {
-      new Polymer.IronMeta({type: 'animation', key: this.is, value: this.constructor});
-    },
-
-    /**
-     * Do any animation configuration here.
-     */
-    // configure: function(config) {
-    // },
-
-    /**
-     * Returns the animation timing by mixing in properties from `config` to the defaults defined
-     * by the animation.
-     */
-    timingFromConfig: function(config) {
-      if (config.timing) {
-        for (var property in config.timing) {
-          this.animationTiming[property] = config.timing[property];
-        }
-      }
-      return this.animationTiming;
-    },
-
-    /**
-     * Sets `transform` and `transformOrigin` properties along with the prefixed versions.
-     */
-    setPrefixedProperty: function(node, property, value) {
-      var map = {
-        'transform': ['webkitTransform'],
-        'transformOrigin': ['mozTransformOrigin', 'webkitTransformOrigin']
-      };
-      var prefixes = map[property];
-      for (var prefix, index = 0; prefix = prefixes[index]; index++) {
-        node.style[prefix] = value;
-      }
-      node.style[property] = value;
-    },
-
-    /**
-     * Called when the animation finishes.
-     */
-    complete: function() {}
-
-  };
-
-</script>