Backout f89ae3c450ce (bug 1324892) for busting Thunderbird. r=me

widget/cocoa/nsCocoaWindow.mm

@@ -472,9 +472,6 @@ nsresult nsCocoaWindow::CreateNativeWindow(const NSRect &aRect,
   mWindow = [[windowClass alloc] initWithContentRect:contentRect styleMask:features 
                                  backing:NSBackingStoreBuffered defer:YES];
 
-  // By default, hide window titles.
-  [mWindow setTitleVisibility:NSWindowTitleHidden];
-
   // setup our notification delegate. Note that setDelegate: does NOT retain.
   mDelegate = [[WindowDelegate alloc] initWithGeckoWindow:this];
   [mWindow setDelegate:mDelegate];
@@ -1843,11 +1840,9 @@ nsCocoaWindow::SetTitle(const nsAString& aTitle)
   if ([mWindow drawsContentsIntoWindowFrame] && ![mWindow wantsTitleDrawn]) {
     // Don't cause invalidations.
     [mWindow disableSetNeedsDisplay];
-    [mWindow setTitleVisibility:NSWindowTitleHidden];
     [mWindow setTitle:title];
     [mWindow enableSetNeedsDisplay];
   } else {
-    [mWindow setTitleVisibility:NSWindowTitleVisible];
     [mWindow setTitle:title];
   }