Some fixes to make NNTP themes work again.

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 383 matching lines @@
   display: block;
   line-height: 20px;
   -webkit-box-sizing: border-box;
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
   text-decoration: none;
   font-size: 100%;
 }
 
+.item:visited,
+.item:link {
+  color: hsl(213, 90%, 24%);
+}
+
 html[dir='rtl'] .item {
   background-position-x: 100%;
   padding-right: 18px;
   padding-left: 2px;
   text-align: right;
 }
 
 .tips-title {
   color: black;
   text-decoration: none;
@@ skipping 297 matching lines @@
   }
 
   #t3, #t7 {
     left: 534px;
   }
 
   #t4, #t5, #t6, #t7 {
     top: 147px;
   }
 }