[NTP4] Overlap of apps in NTP when deleting and reinstalling app

R=estade@chromium.org
TEST=Install app, move to first position on NTP, uninstall Extensions page, idle
NTPs should be updated correctly.
BUG=116284

Review URL: https://chromiumcodereview.appspot.com/9549016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124355 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/ntp4/tile_page.js

@@ -298,7 +298,7 @@ cr.define('ntp', function() {
       if (opt_animate)
         this.firstChild.classList.add('removing-tile-contents');
       else
-        this.parentNode.removeChild(this);
+        this.tilePage.removeTile(this, false);
     },
 
     /**