Move webui resources from chrome\browser\resources\shared to ui\webui\resources.

chrome/browser/resources/shared/css/menu_button.css

Index: chrome/browser/resources/shared/css/menu_button.css
===================================================================
--- chrome/browser/resources/shared/css/menu_button.css	(revision 177292)
+++ chrome/browser/resources/shared/css/menu_button.css	(working copy)
@@ -1,31 +0,0 @@
-/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file. */
-
-/* NOTE: If you are using the drop-down style, you must first call
- * MenuButton.createDropDownArrows() to initialize the CSS canvases that
- * contain the arrow images. */
-
-button.menu-button.drop-down {
-  background: white -webkit-canvas(drop-down-arrow) no-repeat center 4px;
-  border: 1px solid rgb(192, 195, 198);
-  border-radius: 2px;
-  height: 12px;
-  margin: 0 5px;
-  padding: 0;
-  position: relative;
-  top: 1px;
-  width: 12px;
-}
-
-button.menu-button.drop-down:hover {
-  background-image: -webkit-canvas(drop-down-arrow-hover);
-  border-color: rgb(48, 57, 66);
-}
-
-button.menu-button.drop-down[menu-shown],
-button.menu-button.drop-down:focus {
-  background-color: rgb(48, 57, 66);
-  background-image: -webkit-canvas(drop-down-arrow-active);
-  border-color: rgb(48, 57, 66);
-}