Fix various issues from r343263.

components/dom_distiller/core/javascript/dom_distiller_viewer.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.
 
 // This variable will be changed by iOS scripts.
 var distiller_on_ios = false;
 
+var navigate_on_initial_content_load = false;
+
+function didNavigateOnInitialContentLoad() {
+  navigate_on_initial_content_load = true;
+}
+
 function addToPage(html) {
   var div = document.createElement('div');
   div.innerHTML = html;
   document.getElementById('content').appendChild(div);
   fillYouTubePlaceholders();
 
-  if (typeof navigate_on_initial_content_load !== 'undefined' &&

[Lei Zhang, 2015/08/14 05:44:36]

Why isn't |navigate_on_initial_content_load| properly defined as a variable? I
see in https://codereview.chromium.org/1125343004, patchset 11 had it written
the way I did here, but then it changed. What happened? Was the change reviewed?

[csaavedra, 2015/08/14 08:21:37]

As explained earlier, the code injected from
PrintPreviewDistiller::DidFinishLoad() can run before the distiller's JS, hence
the method can possibly be undefined. That's why it got changed.

See https://codereview.chromium.org/1125343004/#msg70

-      navigate_on_initial_content_load) {
+  if (navigate_on_initial_content_load) {
     navigate_on_initial_content_load = false;
     setTimeout(function() {
         window.location = window.location + "#loaded";
     }, 0);
   }
 }
 
 function fillYouTubePlaceholders() {
   var placeholders = document.getElementsByClassName('embed-placeholder');
   for (var i = 0; i < placeholders.length; i++) {
@@ skipping 367 matching lines @@
         shiftY: shiftY
       };
     }
   };
 }());
 
 window.addEventListener('touchstart', pincher.handleTouchStart, false);
 window.addEventListener('touchmove', pincher.handleTouchMove, false);
 window.addEventListener('touchend', pincher.handleTouchEnd, false);
 window.addEventListener('touchcancel', pincher.handleTouchCancel, false);