Partial backout of changeset 1a50eaa93b36 in an attempt to fix the Mac twinopen perf regression, b=439354

browser/themes/pinstripe/browser/browser.css

@@ -55,6 +55,10 @@
 
 /* ----- INACTIVE WINDOW ----- */
 
+#main-window:not([active="true"]) > #navigator-toolbox > #nav-bar {
+  background-image: url("chrome://global/skin/toolbar/toolbar-background-inactive.png");
+}
+
 #main-window:not([active="true"]) > #navigator-toolbox > #PersonalToolbar {
   background-image: url("chrome://browser/skin/bookmark_toolbar_background-inactive.png");
 }
@@ -1582,6 +1586,10 @@ toolbarbutton.chevron > .toolbarbutton-menu-dropmarker {
 }
 
 #nav-bar {
+  background-color: #9e9e9e;
+  background-image: url("chrome://global/skin/toolbar/toolbar-background.gif");
+  background-repeat: repeat-x;
+  background-position: top right;
   padding: 0 4px;
 }