Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/neon-animation/neon-shared-element-animatable-behavior.html

Index: third_party/polymer/v1_0/components/neon-animation/neon-shared-element-animatable-behavior.html
diff --git a/third_party/polymer/v1_0/components/neon-animation/neon-shared-element-animatable-behavior.html b/third_party/polymer/v1_0/components/neon-animation/neon-shared-element-animatable-behavior.html
deleted file mode 100644
index e63173d368da1ba027e508122a65a2d508b861ff..0000000000000000000000000000000000000000
--- a/third_party/polymer/v1_0/components/neon-animation/neon-shared-element-animatable-behavior.html
+++ /dev/null
@@ -1,43 +0,0 @@
-<!--
-@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="neon-animatable-behavior.html">
-
-<script>
-
-  /**
-   * Use `Polymer.NeonSharedElementAnimatableBehavior` to implement elements containing shared element
-   * animations.
-   * @polymerBehavior Polymer.NeonSharedElementAnimatableBehavior
-   */
-  Polymer.NeonSharedElementAnimatableBehaviorImpl = {
-
-    properties: {
-
-      /**
-       * A map of shared element id to node.
-       */
-      sharedElements: {
-        type: Object,
-        value: {}
-      }
-
-    }
-
-  };
-
-  /** @polymerBehavior Polymer.NeonSharedElementAnimatableBehavior */
-  Polymer.NeonSharedElementAnimatableBehavior = [
-    Polymer.NeonAnimatableBehavior,
-    Polymer.NeonSharedElementAnimatableBehaviorImpl
-  ];
-
-</script>