Print Preview: Fix top level directory compile errors

chrome/browser/resources/print_preview/print_preview_focus_manager.js

 // Copyright 2014 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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * FocusManager implementation specialized for Print Preview, which ensures
    * that Print Preview itself does not receive focus when an overlay is shown.
    * @constructor
    * @extends {cr.ui.FocusManager}
    */
   function PrintPreviewFocusManager() {
-  };
+  }
 
   cr.addSingletonGetter(PrintPreviewFocusManager);
 
   PrintPreviewFocusManager.prototype = {
     __proto__: cr.ui.FocusManager.prototype,
 
     /** @override */
     getFocusParent: function() {
       var el = document.body;
       var newEl = null;
-      while (newEl = el.querySelector('.overlay:not([hidden])'))
+      while ((newEl = el.querySelector('.overlay:not([hidden])')))

[dpapad, 2017/05/05 23:30:29]

That was probably an auto-fix for linter for
http://eslint.org/docs/rules/no-cond-assign. Maybe consider reverting this for
now, I'll probably turn off this rule.

[rbpotter, 2017/05/06 00:02:19]

Done.

         el = newEl;
       return el;
     }
   };
 
   // Export
   return {
     PrintPreviewFocusManager: PrintPreviewFocusManager
   };
 });