Reduce FOR_EACH_OBSERVER usage in ui/

ui/events/ozone/device/device_manager_manual.cc

 // Copyright 2014 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/events/ozone/device/device_manager_manual.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_enumerator.h"
 #include "base/location.h"
@@ skipping 48 matching lines @@
 void DeviceManagerManual::RemoveObserver(DeviceEventObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void DeviceManagerManual::OnDevicesScanned(
     std::vector<base::FilePath>* result) {
   std::vector<base::FilePath>::const_iterator it = result->begin();
   for (; it != result->end(); ++it) {
     devices_.push_back(*it);
     DeviceEvent event(DeviceEvent::INPUT, DeviceEvent::ADD, *it);
-    FOR_EACH_OBSERVER(DeviceEventObserver, observers_, OnDeviceEvent(event));
+    for (DeviceEventObserver& observer : observers_)
+      observer.OnDeviceEvent(event);
   }
 }
 
 }  // namespace ui