A couple of NNTP bug fixes

chrome/browser/resources/new_new_tab.css

 html {
   /* This is needed because of chrome://theme/css/new_tab.css */
   height: 100%;
 }
 
 body {
   margin: 0;
 }
 
 #main {
@@ skipping 450 matching lines @@
                         to visible which unfortunately breaks the ellipsis for t
                         he window items */
   background-image: url(chrome://theme/newtab_closed_window);
 }
 
 .window-menu {
   position: absolute;
   display: none;
   border: 1px solid #999;
   -webkit-box-shadow: 5px 5px 10px hsla(0, 0%, 0%, .3);
-  background-color: white;
+  background-color: hsla(213, 0%, 100%, .95);
   width: 157px;
   left: 0;
   white-space: nowrap;
-  opacity: .9;
   z-index: 1;
-  pointer-events: none;
   padding: 1px;
+  cursor: default;
 }
 
 .hbox {
   display: -webkit-box;
   -webkit-box-orient: horizontal;
 }
 
 #recent-tabs,
 #downloads {
   -webkit-box-flex: 1;
@@ skipping 161 matching lines @@
 #option-menu > div {
   padding: 3px 8px;
   overflow: hidden;
   text-overflow: ellipsis;
 }
 
 #option-menu > [selected] {
   background-color: hsla(213, 66%, 57%, 1);
   color: white;
 }