Remove usage of FOR_EACH_OBSERVER macro in device/

device/bluetooth/test/mock_bluetooth_gatt_notify_session.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 "device/bluetooth/test/mock_bluetooth_gatt_notify_session.h"
 #include "device/bluetooth/test/mock_bluetooth_adapter.h"
 #include "device/bluetooth/test/mock_bluetooth_gatt_characteristic.h"
 
 using testing::Return;
 
@@ skipping 22 matching lines @@
 }
 
 void MockBluetoothGattNotifySession::StopTestNotifications() {
   test_notifications_timer_.Stop();
 }
 
 void MockBluetoothGattNotifySession::DoNotify(
     MockBluetoothAdapter* adapter,
     MockBluetoothGattCharacteristic* characteristic,
     const std::vector<uint8_t>& value) {
-  FOR_EACH_OBSERVER(
-      BluetoothAdapter::Observer, adapter->GetObservers(),
-      GattCharacteristicValueChanged(adapter, characteristic, value));
+  for (auto& observer : adapter->GetObservers())
+    observer.GattCharacteristicValueChanged(adapter, characteristic, value);
 }
 
 }  // namespace device