Remove some platform specific stuff from views.

ui/file_manager/file_manager/foreground/css/menu.css

Index: ui/file_manager/file_manager/foreground/css/menu.css
diff --git a/ui/file_manager/file_manager/foreground/css/menu.css b/ui/file_manager/file_manager/foreground/css/menu.css
deleted file mode 100644
index ccb2eec396f2326b24d2d0d5e0a060ae9cd71c86..0000000000000000000000000000000000000000
--- a/ui/file_manager/file_manager/foreground/css/menu.css
+++ /dev/null
@@ -1,42 +0,0 @@
-/* Copyright 2013 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. */
-
-/* Derived from /ui/webui/resources/css/menu.css. */
-
-menu {
-  position: fixed;
-  white-space: nowrap;
-  z-index: 3;
-}
-
-menu:not(.decorated) {
-  display: none;
-}
-
-menu > * {
-  box-sizing: border-box;
-  display: block;
-  text-align: start;
-  width: 100%;
-}
-
-menu > hr {
-  border: 0;
-  height: 1px;
-}
-
-menu > [hidden] {
-  display: none;
-}
-
-menu > [shortcutText]::after {
-  -webkit-padding-start: 30px;
-  color: #999;
-  content: attr(shortcutText);
-  float: right;
-}
-
-html[dir='rtl'] menu > [shortcutText]::after {
-  float: left;
-}