NNTP: Add a menu item that allows the user to restore all blacklisted...

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 402 matching lines @@
                         he window items */
   background-image: url(chrome://theme/newtab_closed_window);
 }
 
 .window-menu {
   position: absolute;
   display: none;
   border: 1px solid #999;
   -webkit-box-shadow: 2px 2px 3px hsla(0, 0%, 0%, .3);
   background-color: hsla(213, 0%, 100%, .95);
-  width: 157px;
   left: 0;
   white-space: nowrap;
   z-index: 2;
   padding: 1px;
   cursor: default;
 }
 
+.window-menu > hr {
+  border: 0;
+  border-top: 1px solid rgb(153, 153, 153);
+  margin: 2px 0;
+}
+
 /* Made to look like a tooltip using vista/win7 look and feel.
    TODO(arv): Replace with -webkit-appearance once issue 17371 is fixed
  */
 #window-tooltip {
   color: #555;
   pointer-events: none;
   border: 1px solid rgb(118,118,118);
   -webkit-border-radius: 3px;
   padding: 0px 3px;
   background: -webkit-gradient(linear, left top, left bottom,
@@ skipping 252 matching lines @@
   #t3, #t7,
   html[dir='rtl'] #t0,
   html[dir='rtl'] #t4 {
     left: 534px;
   }
 
   #t4, #t5, #t6, #t7 {
     top: 147px;
   }
 }