Fix bug # 75772: On Mac OS X, add support for window toolbar button which hides/shows toolbar buttons. r=ben sr=hyatt

suite/common/history/history.xul

@@ -140,7 +140,7 @@
 </toolbox>
 
   <outliner id="historyOutliner"/>
-  <statusbar id="status-bar">
+  <statusbar id="status-bar" class="chromeclass-status">
     <statusbarpanel id="statusbar-display" crop="right" flex="1"/>
     <statusbarpanel class="statusbarpanel-icononly" id="offline-status"/>
   </statusbar>