ui/views: convert usage of FOR_EACH_OBSERVER macro

ui/views/widget/desktop_aura/x11_desktop_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/desktop_aura/x11_desktop_handler.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 
 #include "base/message_loop/message_loop.h"
@@ skipping 76 matching lines @@
          (event->type == PropertyNotify &&
           event->xproperty.window == x_root_window_);
 }
 
 uint32_t X11DesktopHandler::DispatchEvent(const ui::PlatformEvent& event) {
   switch (event->type) {
     case PropertyNotify: {
       if (event->xproperty.atom ==
           atom_cache_.GetAtom("_NET_CURRENT_DESKTOP")) {
         if (UpdateWorkspace()) {
-          FOR_EACH_OBSERVER(views::X11DesktopHandlerObserver, observers_,
-                            OnWorkspaceChanged(workspace_));
+          for (views::X11DesktopHandlerObserver& observer : observers_)
+            observer.OnWorkspaceChanged(workspace_);
         }
       }
       break;
     }
     case CreateNotify:
       OnWindowCreatedOrDestroyed(event->type, event->xcreatewindow.window);
       break;
     case DestroyNotify:
       OnWindowCreatedOrDestroyed(event->type, event->xdestroywindow.window);
       break;
@@ skipping 25 matching lines @@
     // The window might be destroyed if the message pump did not get a chance to
     // run but we can safely ignore the X error.
     gfx::X11ErrorTracker error_tracker;
     ui::XMenuList::GetInstance()->MaybeRegisterMenu(window);
   } else {
     ui::XMenuList::GetInstance()->MaybeUnregisterMenu(window);
   }
 }
 
 }  // namespace views