Removed Polymer elements depending on web-animations-js.

third_party/polymer/components/paper-menu-button/paper-menu-button.css

-/*
-Copyright 2013 The Polymer Authors. All rights reserved.
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file.
-*/
-
-:host {
-  display: inline-block;
-  padding: 8px;
-  position: relative;
-  background-image: none;
-  outline: none;
-  user-select: none;
-  -webkit-user-select: none;
-  cursor: pointer;
-  overflow: hidden;
-}
-
-:host([disabled]) {
-  cursor: auto;
-}
-
-core-icon {
-  position: relative;
-}
-
-core-icon::shadow svg {
-  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
-  -webkit-transition: -webkit-transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
-  transform-origin: 50% 50%;
-  -webkit-transform-origin: 50% 50%;
-}
-
-:host(:hover) core-icon::shadow svg {
-  transform: scale(1.2);
-  -webkit-transform: scale(1.2);
-}
-
-:host([disabled]:hover) core-icon::shadow svg {
-  transform: none;
-  -webkit-transform: none;
-}
-
-:host([disabled]) core-icon::shadow path {
-  fill: #c9c9c9;
-}
-
-#overlay {
-  display: block;
-        position: fixed;
-  border-radius: 3px;
-}
-
-.paper-menu-button-overlay-ink {
-        position: absolute;
-        top: 0;
-        left: 0;
-        width: 40px;
-        height: 40px;
-        border-radius: 20px;
-  background: #fff;
-  opacity: 0;
-  transform: scale(0);
-  -webkit-transform: scale(0);
-}
-
-:host([halign="right"]) .paper-menu-button-overlay-ink {
-        left: auto;
-        right: 0;
-}
-
-.paper-menu-button-overlay-bg {
-        position: absolute;
-        top: 0;
-        left: 0;
-        bottom: 0;
-        right: 0;
-        border-radius: 3px;
-  background: #fff;
-  opacity: 0;
-}
-
-#menu {
-        position: relative;
-  margin: 0;
-}