Remove FOR_EACH_OBSERVER macro usage in chrome/browser/ui

chrome/browser/ui/webui/chromeos/login/oobe_ui.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 "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 583 matching lines @@
     }
     screen_dimmer_->set_at_bottom(true);
     screen_dimmer_->SetDimming(should_dim);
   } else {
     // TODO: Ash needs to expose screen dimming api. See
     // http://crbug.com/646034.
     NOTIMPLEMENTED();
   }
 
   current_screen_ = new_screen;
-  FOR_EACH_OBSERVER(Observer,
-                    observer_list_,
-                    OnCurrentScreenChanged(current_screen_, new_screen));
+  for (Observer& observer : observer_list_)
+    observer.OnCurrentScreenChanged(current_screen_, new_screen);
 }
 
 }  // namespace chromeos