Revert "Polymer elements added to third_party/polymer."

third_party/polymer/components/core-menu/core-menu.css

Index: third_party/polymer/components/core-menu/core-menu.css
diff --git a/third_party/polymer/components/core-menu/core-menu.css b/third_party/polymer/components/core-menu/core-menu.css
deleted file mode 100644
index 7cf6ab56ac667a3b411e0815dd4cfe310e3ef314..0000000000000000000000000000000000000000
--- a/third_party/polymer/components/core-menu/core-menu.css
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
-Copyright (c) 2014 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
-*/
-
-html /deep/ core-menu {
-  display: block;
-  margin: 12px;
-}
-
-polyfill-next-selector { content: 'core-menu > core-item'; }
-html /deep/ core-menu::shadow ::content > core-item {
-  cursor: default;
-}