Bug 1135085 - Change from utilities.png to the utilities.svg icon for the tab icon. r=josiah

mail/components/preferences/aboutPreferences.xul

@@ -40,8 +40,6 @@
          title="&prefWindow.titleMAC;">
 #endif
 #endif
-  <xhtml:link rel="shortcut icon"
-              href="chrome://mozapps/skin/extensions/utilities.png"/>
 
   <stringbundle id="bundleBrand" src="chrome://branding/locale/brand.properties"/>
   <stringbundle id="bundlePreferences"

mail/themes/shared/mail/tabmail.css

@@ -40,6 +40,10 @@
   z-index: 2;
 }
 
+.tabmail-tab[type="preferencesTab"] {
+  list-style-image: url("chrome://mozapps/skin/extensions/utilities.svg#utilities");
+}
+
 .tab-background-middle {
   -moz-box-flex: 1;
   background-clip: padding-box;