Fix issues with right border of the lower section as well as some CSS...

chrome/browser/resources/new_new_tab.css

Index: chrome/browser/resources/new_new_tab.css
===================================================================
--- chrome/browser/resources/new_new_tab.css	(revision 21750)
+++ chrome/browser/resources/new_new_tab.css	(working copy)
@@ -85,6 +85,10 @@
   border: 3px solid hsl(213, 60%, 92%);
 }
 
+.list > .filler * {
+  visibility: hidden !important;
+}
+
 .filler .thumbnail {
   visibility: inherit;
   border: 1px solid white;
@@ -264,12 +268,13 @@
   -webkit-box-shadow: 0px 2px 2px hsla(0, 0%, 0%, .5);
 }
 
-.dragging {
-  -webkit-transition: none;
+.dragging,
+.dragging * {
+  -webkit-transition: none !important;
 }
 
 .dragging > .title {
-  opacity: 0 !important;
+  opacity: 0;
 }
 
 .list > .dragging > .title {
@@ -505,8 +510,6 @@
 }
 
 .section {
-  -webkit-box-flex: 1;
-  width: 50%;
   display: inline-block;
 }