Only trigger navigation in distiller if in print preview

components/dom_distiller/core/javascript/dom_distiller_viewer.js

Index: components/dom_distiller/core/javascript/dom_distiller_viewer.js
diff --git a/components/dom_distiller/core/javascript/dom_distiller_viewer.js b/components/dom_distiller/core/javascript/dom_distiller_viewer.js
index 5baef4c077b01e799ed52389fda294a596d17fb9..641c2958e09ac5b1bc212cd366b1f28ba3cb147b 100644
--- a/components/dom_distiller/core/javascript/dom_distiller_viewer.js
+++ b/components/dom_distiller/core/javascript/dom_distiller_viewer.js
@@ -43,7 +43,8 @@ function showLoadingIndicator(isLastPage) {
   // This function will be one of the last things to occur when a page is
   // loaded. This is temporarily used to signal print preview to generate
   // a PDF.
-  if (isLastPage) {
+  if (isLastPage && typeof isPrintPreviewDistiller !== 'undefined'
+      && isPrintPreviewDistiller) {
     setTimeout(function() {
         window.location = window.location + "#loaded";
     }, 0);