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

chrome/browser/resources/options2/browser_options.js

Index: chrome/browser/resources/options2/browser_options.js
diff --git a/chrome/browser/resources/options2/browser_options.js b/chrome/browser/resources/options2/browser_options.js
index ab34db5496e378d44e1e84b13310a47ff9bae49b..a5d3e6623b6bb395241416db886cd93b7f910eb4 100644
--- a/chrome/browser/resources/options2/browser_options.js
+++ b/chrome/browser/resources/options2/browser_options.js
@@ -111,6 +111,13 @@ cr.define('options', function() {
             self.onHomePagePrefChanged_.bind(self));
       });
 
+      if ($('set-wallpaper') && !templateData.compact_mode) {
+        $('set-wallpaper').hidden = false;
+        $('set-wallpaper').onclick = function(event) {
+          OptionsPage.navigateToPage('setWallpaper');
+        };
+      }
+
       $('themes-gallery').onclick = function(event) {
         window.open(localStrings.getString('themesGalleryURL'));
       };