Some fixes to make NNTP themes work again.

chrome/browser/resources/new_tab_theme.css

Index: chrome/browser/resources/new_tab_theme.css
===================================================================
--- chrome/browser/resources/new_tab_theme.css	(revision 21515)
+++ chrome/browser/resources/new_tab_theme.css	(working copy)
@@ -13,6 +13,15 @@
   height:100%;
   overflow:auto;
 }
+#main {
+  background: url(chrome://theme/product_logo?$1) no-repeat 0 8px;
+}
+:visited,
+.link {
+  cursor: pointer;
+  text-decoration: underline;
+  color: $8;
+}
 .thumbnail-container,
 .list > .thumbnail-container > .title,
 .list .title > div,
@@ -33,12 +42,6 @@
 .thumbnail-container:hover > .edit-mode-border {
   background-color: $6;
 }
-:visited,
-.link {
-  cursor: pointer;
-  text-decoration: underline;
-  color: $8;
-}
 .edit-mode-border {
   background-color: $7;
 }
@@ -52,7 +55,7 @@
                                      to($6));
   color: $$1;
 }
-#view-toolbar input {
+#view-toolbar > input {
   background-color: $7;
   -webkit-mask-image: url(chrome://theme/newtab_menu_mask);
 }