Reduce FOR_EACH_OBSERVER usage in ui/

ui/display/fake_display_delegate.cc

 // Copyright 2016 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/display/fake_display_delegate.h"
 
 #include <inttypes.h>
 
 #include <string>
 #include <utility>
@@ skipping 210 matching lines @@
     }
   }
 
   return true;
 }
 
 void FakeDisplayDelegate::OnConfigurationChanged() {
   if (!initialized_)
     return;
 
-  FOR_EACH_OBSERVER(ui::NativeDisplayObserver, observers_,
-                    OnConfigurationChanged());
+  for (ui::NativeDisplayObserver& observer : observers_)
+    observer.OnConfigurationChanged();
 }
 
 }  // namespace display