MD Settings: show an extension-controlled-indicator for proxy

chrome/browser/resources/settings/settings_ui/settings_ui.js

Index: chrome/browser/resources/settings/settings_ui/settings_ui.js
diff --git a/chrome/browser/resources/settings/settings_ui/settings_ui.js b/chrome/browser/resources/settings/settings_ui/settings_ui.js
index b009c069e0f49e6f7fcaf3316fd5dabd0061faa5..2ab3bf3479aaa98e94061421dd5d9044f2ad51ec 100644
--- a/chrome/browser/resources/settings/settings_ui/settings_ui.js
+++ b/chrome/browser/resources/settings/settings_ui/settings_ui.js
@@ -143,6 +143,11 @@ Polymer({
     this.$.main.searchContents(urlSearchQuery);
   },
 
+  /** @return {SettingsPrefsElement} */
+  getPrefsElement: function() {
+    return this.$.prefs;
+  },
+
   /**
    * Handles the 'search-changed' event fired from the toolbar.
    * @param {!Event} e