Update reader mode viewer according to specs

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 bf114cf6c9ad14639da53c4fef3a71e2e56ad27c..f953414f028f055b849012a2330f92f1f680a242 100644
--- a/components/dom_distiller/core/javascript/dom_distiller_viewer.js
+++ b/components/dom_distiller/core/javascript/dom_distiller_viewer.js
@@ -43,20 +43,12 @@ function showLoadingIndicator(isLastPage) {
   updateLoadingIndicator(isLastPage);
 }
 
-// Sets the title. The title will be exposed with a simple animation. This
-// should only be used when the title was not included in the initial html.
+// Sets the title.
 function setTitle(title) {
   var holder = document.getElementById('titleHolder');
-  var collapse = document.getElementById('titleCollapse');
-
-  collapse.style.height = "0px";
 
   holder.textContent = title;
   document.title = title;
-  var newHeight = Math.max(90, holder.getBoundingClientRect().height);
-
-  collapse.style.transition = "height 0.2s";
-  collapse.style.height = newHeight + "px";
 }
 
 // Set the text direction of the document ('ltr', 'rtl', or 'auto').