Bug #253359 --> rss servers and folders should use the artwork for news instead of mail accounts

mail/extensions/newsblog/content/toolbar-icon.xul

@@ -1,6 +1,8 @@
 <?xml version="1.0"?>
+<?xml-stylesheet href="chrome://messenger-newsblog/skin/newsBlogOverlay.css" type="text/css"?> 
 
 <!DOCTYPE overlay SYSTEM "chrome://messenger-newsblog/locale/newsblog.dtd">
+
 <overlay xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 
 <script type="application/x-javascript">

mail/extensions/newsblog/skin/jar.mn

@@ -1,3 +1,4 @@
 classic.jar:
   skin/classic/messenger-newsblog/subscriptions.css             (subscriptions.css)
+  skin/classic/messenger-newsblog/newsBlogOverlay.css            (newsBlogOverlay.css)
   skin/classic/messenger-newsblog/contents.rdf                  

mail/extensions/newsblog/skin/newsBlogOverlay.css

@@ -0,0 +1,56 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is RSS News & Blogs CSS Overlay style rules.
+ *
+ * Contributor(s):
+ *   Myk Melez <myk@melez.com>
+ *   Scott MacGregor <mscott@mozilla.org>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/* ::::: Folder Pane icons :::::: */
+
+treechildren::-moz-tree-image(folderNameCol, serverType-rss) {
+  list-style-image: url("chrome://messenger/skin/icons/folder-newsgroup.png");
+}
+
+treechildren::-moz-tree-image(folderNameCol, isServer-true, serverType-rss) {
+  list-style-image: url("chrome://messenger/skin/icons/server-news.png");
+}
+
+treechildren::-moz-tree-image(folderNameCol, specialFolder-Trash) {
+  list-style-image: url("chrome://messenger/skin/icons/folder-trash.png");
+}
+
+/* ::::: Thread Pane icons :::::: */
+
+treechildren::-moz-tree-image(subjectCol, rss) {
+  list-style-image: url("chrome://messenger/skin/icons/message-news.png");
+}
+
+treechildren::-moz-tree-image(subjectCol, rss, new) {
+  list-style-image: url("chrome://messenger/skin/icons/message-news-new.png");
+}