MD Settings: Move browserProxies outside of Polymer "properties".

chrome/browser/resources/settings/search_engines_page/omnibox_extension_entry.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview 'settings-omnibox-extension-entry' is a component for showing
  * an omnibox extension with its name and keyword.
  */
 Polymer({
   is: 'settings-omnibox-extension-entry',
 
   properties: {
     /** @type {!SearchEngine} */
     engine: Object,
+  },
 
-    /** @private {!settings.ExtensionControlBrowserProxy} */
-    browserProxy_: Object,
-  },
+  /** @private {?settings.ExtensionControlBrowserProxy} */
+  browserProxy_: null,
 
   /** @override */
   created: function() {
     this.browserProxy_ =
         settings.ExtensionControlBrowserProxyImpl.getInstance();
   },
 
   /** @private */
   onManageTap_: function() {
     this.closePopupMenu_();
@@ skipping 20 matching lines @@
     return cr.icon.getFavicon(url);
   },
 
   /** @private */
   onDotsTap_: function() {
     /** @type {!CrActionMenuElement} */ (
         this.$$('dialog[is=cr-action-menu]')).showAt(
             assert(this.$$('paper-icon-button')));
   },
 });