Refactoring of code by moving navigate_() to separate file.

chrome/browser/resources/pdf/open_pdf_params_parser.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.
 
 'use strict';
 
 /**
  * Creates a new OpenPDFParamsParser. This parses the open pdf parameters
  * passed in the url to set initial viewport settings for opening the pdf.
- * @param {string} url to be parsed.
  */
-function OpenPDFParamsParser(url) {
+function OpenPDFParamsParser() {
   // A dictionary of all the named destinations in the PDF.
   this.namedDestinations = {};
 }
 
 OpenPDFParamsParser.prototype = {
   /**
    * @private
    * Parse zoom parameter of open PDF parameters. If this
    * parameter is passed while opening PDF then PDF should be opened
    * at the specified zoom level.
@@ skipping 68 matching lines @@
       if (!isNaN(pageNumber) && pageNumber > 0)
         viewportPosition['page'] = pageNumber - 1;
     }
 
     if ('zoom' in paramsDictionary)
       this.parseZoomParam_(paramsDictionary['zoom'], viewportPosition);
 
     return viewportPosition;
   }
 };