Enable user change background image in settings page in Aura build.

chrome/browser/resources/options2/chromeos/change_picture_options.css

Index: chrome/browser/resources/options2/chromeos/change_picture_options.css
diff --git a/chrome/browser/resources/options2/chromeos/change_picture_options.css b/chrome/browser/resources/options2/chromeos/change_picture_options.css
deleted file mode 100644
index c3e1cf89179ad5c624afc5f0452a5d479af4d666..0000000000000000000000000000000000000000
--- a/chrome/browser/resources/options2/chromeos/change_picture_options.css
+++ /dev/null
@@ -1,37 +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. */
-
-#images-grid {
-  -webkit-user-drag: none;
-  -webkit-user-select: none;
-  margin: 10px;
-  outline: none;
-  padding: 10px;
-  width: 600px;
-}
-
-#images-grid * {
-  margin: 0;
-  padding: 0;
-}
-
-#images-grid img {
-  background-color: white;
-  height: 64px;
-  vertical-align: middle;
-  width: 64px;
-}
-
-#images-grid [role=listitem] {
-  border: 1px solid rgba(0, 0, 0, 0.15);
-  border-radius: 4px;
-  display: inline-block;
-  margin: 10px;
-  padding: 3px;
-}
-
-#images-grid [selected] {
-  border: 2px solid rgb(0, 102, 204);
-  padding: 2px;
-}