Fix for PDFs with lots of named destinations take a long time to load.

chrome/browser/resources/pdf/navigator.js

 // Copyright 2015 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 Navigator for navigating to links inside or outside the PDF.
  * @param {string} originalUrl The original page URL.
  * @param {Object} viewport The viewport info of the page.
@@ skipping 53 matching lines @@
     }
     // Make sure inputURL is not only a scheme.
     if (url == 'http://' ||
         url == 'https://' ||
         url == 'ftp://' ||
         url == 'file://' ||
         url == 'mailto:') {
       return;
     }
 
-    if (newTab) {
+    if (newTab)
       this.navigateInNewTabCallback_(url);
-    } else {
-      var pageNumber =
-          this.paramsParser_.getViewportFromUrlParams(url).page;
-      if (pageNumber != undefined)
-        this.viewport_.goToPage(pageNumber);
-      else
-        this.navigateInCurrentTabCallback_(url);
-    }

[raymes, 2015/02/12 22:19:04]

None of this should be removed. Instead the code should look like this:

  this.paramsParser_.getViewportFromUrlParams(url, onViewportReceived);
}

onViewportReceived: function(initialViewport) {
  var pageNumber = initialViewport.pageNumber;
  if (pageNumber != undefined)
    this.viewport_.goToPage(pageNumber);
  else
    this.navigateInCurrentTabCallback_(url);
});

+    else
+      this.navigateInCurrentTabCallback_(url);
   }
 };