[NTP4] Make TilePage and CardSlider evented to simplify code and fix page switcher bug

chrome/browser/resources/ntp4/nav_dot.js

Index: chrome/browser/resources/ntp4/nav_dot.js
diff --git a/chrome/browser/resources/ntp4/nav_dot.js b/chrome/browser/resources/ntp4/nav_dot.js
index 1686e80f1755079338db5f1c3455f6249c298e79..98c3d975b21ca7a57d2ee18dff804f118a8f6169 100644
--- a/chrome/browser/resources/ntp4/nav_dot.js
+++ b/chrome/browser/resources/ntp4/nav_dot.js
@@ -92,10 +92,15 @@ cr.define('ntp4', function() {
     },
 
     /**
-     * Removes the dot from the page after transitioning to 0 width.
+     * Removes the dot from the page. If |opt_animate| is truthy, we first
+     * transition the element to 0 width.
+     * @param {boolean=} opt_animate Whether to animate the removal or not.
      */
-    animateRemove: function() {
-      this.classList.add('small');
+    remove: function(opt_animate) {
+      if (opt_animate)
+        this.classList.add('small');
+      else
+        this.parentNode.removeChild(this);
     },
 
     /**