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

chrome/browser/resources/options2/options.js

Index: chrome/browser/resources/options2/options.js
diff --git a/chrome/browser/resources/options2/options.js b/chrome/browser/resources/options2/options.js
index 5542a3716c81a9f1eb0cfbeed79b50145727a932..7dc3cb8bc29d90c7699c8d3f20665965ad288caf 100644
--- a/chrome/browser/resources/options2/options.js
+++ b/chrome/browser/resources/options2/options.js
@@ -165,6 +165,13 @@ function load() {
                                   LanguageOptions.getInstance());
     }
   }
+
+  if (SetWallpaperOptions) {
+    OptionsPage.registerOverlay(SetWallpaperOptions.getInstance(),
+                                BrowserOptions.getInstance(),
+                                [$('set-wallpaper')]);
+  }
+
   if (!cr.isWindows && !cr.isMac) {
     OptionsPage.registerOverlay(CertificateBackupOverlay.getInstance(),
                                 CertificateManager.getInstance());