Bug 558643 - Remove unused toolbox-top class. r=gavin

browser/base/content/browser.xul

@@ -355,11 +355,11 @@
     <tooltip id="tabbrowser-tab-tooltip" onpopupshowing="gBrowser.createTooltip(event);"/>
   </popupset>
 
-  <toolbox id="navigator-toolbox" class="toolbox-top" mode="icons"
+  <toolbox id="navigator-toolbox"
+           defaultmode="icons" mode="icons"
 #ifdef WINCE
            defaulticonsize="small" iconsize="small"
 #endif
-           defaultmode="icons"
            persist="tabsontop">
     <!-- Menu -->
     <toolbar type="menubar" id="toolbar-menubar" class="chromeclass-menubar" customizable="true"

toolkit/components/help/content/help.xul

@@ -150,7 +150,7 @@
   <stringbundle id="bundle_help"
                 src="chrome://help/locale/help.properties"/>
 
-    <toolbox id="help-toolbox" class="toolbox-top">
+    <toolbox id="help-toolbox">
       <toolbar id="HelpToolbar" class="chromeclass-toolbar">
         <toolbarbutton id="help-back-button" type="menu-button"
                        label="&backButton.label;"