Remove some platform specific stuff from views.

ui/file_manager/file_manager/foreground/css/drive_welcome.css

Index: ui/file_manager/file_manager/foreground/css/drive_welcome.css
diff --git a/ui/file_manager/file_manager/foreground/css/drive_welcome.css b/ui/file_manager/file_manager/foreground/css/drive_welcome.css
deleted file mode 100644
index 49776cdb9544e6fe2bea9dab08016797f39ca64b..0000000000000000000000000000000000000000
--- a/ui/file_manager/file_manager/foreground/css/drive_welcome.css
+++ /dev/null
@@ -1,196 +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. */
-
-/* Google Drive welcome banners.*/
-.drive-welcome-wrapper {
-  /* This image looks good in high DPI as is. */
-  background-image: url(chrome://resources/images/clouds.png);
-  background-repeat: repeat-x;
-  color: #333;
-}
-
-.drive-welcome-icon {
-  background-image: -webkit-image-set(
-    url('../images/files/ui/drive_logo.png') 1x,
-    url('../images/files/ui/2x/drive_logo.png') 2x);
-  background-repeat: no-repeat;
-}
-
-.drive-welcome-links {
-  display: flex;
-  flex-direction: row;
-}
-
-.drive-welcome-button {
-  -webkit-user-select: none;
-  background-image: linear-gradient(to bottom, #f5f5f5, #f1f1f1);
-  border: 1px solid rgba(0,0,0,0.1);
-  border-radius: 2px;
-  color: #444;
-  cursor: default;
-  display: inline-block;
-  font-size: 13px;
-  font-weight: bold;
-  height: 27px;
-  line-height: 27px;
-  padding: 0 8px;
-  text-align: center;
-  transition: all 218ms;
-}
-
-.drive-welcome-button:hover {
-  background-image: linear-gradient(to bottom, #f8f8f8, #f1f1f1);
-  border-color: #C6C6C6;
-  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
-  color: #222;
-  transition: all 0;
-}
-
-.drive-welcome-button:active {
-  background-image: linear-gradient(to bottom, #f6f6f6, #f1f1f1);
-  box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
-}
-
-
-.drive-welcome-button.drive-welcome-start {
-  background-image:
-    linear-gradient(to bottom, rgb(77, 144, 254), rgb(71, 135, 237));
-  border-color: rgb(48, 121, 237);
-  color: white;
-  text-decoration: none;
-}
-
-.drive-welcome-button.drive-welcome-start:hover {
-  background-image:
-    linear-gradient(to bottom, rgb(77, 144, 254), rgb(53, 122, 232));
-  border-color: rgb(47, 91, 183);
-  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
-}
-
-/* Header welcome banner. */
-.drive-welcome.header {
-  flex: none;
-  height: 100px;
-  overflow: hidden;
-  position: relative;
-  transition: height 180ms ease, visibility 0 linear 180ms;
-}
-
-.dialog-container:not([drive-welcome='header']) .drive-welcome.header {
-  height: 0;
-  visibility: hidden;
-}
-
-.drive-welcome.header .drive-welcome-wrapper {
-  background-size: 308px 100px;
-  bottom: 0;
-  display: flex;
-  flex-direction: row;
-  left: 0;
-  position: absolute;
-  right: 0;
-  top: 0;
-}
-
-.drive-welcome.header .drive-welcome-icon {
-  background-position: center 18px;
-  background-size: 51px 44px;
-  flex: none;
-  width: 120px;
-}
-
-.drive-welcome.header .drive-welcome-message {
-  display: flex;
-  flex: auto;
-  flex-direction: column;
-}
-
-.drive-welcome.header .drive-welcome-title {
-  font-size: 140%;
-  margin-bottom: 4px;
-  margin-top: 14px;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
-.drive-welcome.header .drive-welcome-text {
-  margin-bottom: 6px;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
-.drive-welcome.header .drive-welcome-dismiss {
-  display: none;
-}
-
-/* Full page welcome banner. */
-.drive-welcome.page {
-  bottom: 0;
-  flex: none;
-  left: 0;
-  position: absolute;
-  right: 0;
-  top: 0;
-}
-
-.dialog-container:not([drive-welcome='page']) .drive-welcome.page {
-  display: none;
-}
-
-.drive-welcome.page .cr-dialog-close {
-  display: none;
-}
-
-.drive-welcome.page .drive-welcome-wrapper {
-  align-items: center;
-  background-size: 520px 173px;
-  bottom: 0;
-  display: flex;
-  flex-direction: column;
-  font-size: 120%;
-  left: 0;
-  overflow: hidden;
-  position: absolute;
-  right: 0;
-  top: 0;
-}
-
-.drive-welcome.page .drive-welcome-icon {
-  background-position: center center;
-  height: 240px;
-  left: 0;
-  right: 0;
-  top: 0;
-  width: 100%;
-}
-
-.drive-welcome.page .drive-welcome-message {
-  margin-left: 10px;
-  margin-right: 10px;
-  max-width: 525px;
-}
-
-.drive-welcome.page .drive-welcome-title {
-  font-size: 133%;
-  margin-bottom: 30px;
-  text-align: center;
-}
-
-.drive-welcome.page .drive-welcome-text {
-  margin-bottom: 24px;
-}
-
-.drive-welcome.page .drive-welcome-dismiss {
-  margin-left: 20px;
-}
-
-body:not([type='full-page']) .drive-welcome.page .drive-welcome-wrapper {
-  background-position: 0 0;
-}
-
-body:not([type='full-page']) .drive-welcome.page .drive-welcome-icon {
-  height: 200px;
-}