Remove usage of FOR_EACH_OBSERVER macro in device/

device/bluetooth/bluez/bluetooth_advertisement_bluez.cc

Index: device/bluetooth/bluez/bluetooth_advertisement_bluez.cc
diff --git a/device/bluetooth/bluez/bluetooth_advertisement_bluez.cc b/device/bluetooth/bluez/bluetooth_advertisement_bluez.cc
index d03fd954b132412fd3f541ea2a364b65667f7a55..0adece730c1316d68b7957782b9b192f4bcf47e0 100644
--- a/device/bluetooth/bluez/bluetooth_advertisement_bluez.cc
+++ b/device/bluetooth/bluez/bluetooth_advertisement_bluez.cc
@@ -130,8 +130,8 @@ void BluetoothAdvertisementBlueZ::Unregister(
 void BluetoothAdvertisementBlueZ::Released() {
   LOG(WARNING) << "Advertisement released.";
   provider_.reset();
-  FOR_EACH_OBSERVER(BluetoothAdvertisement::Observer, observers_,
-                    AdvertisementReleased(this));
+  for (auto& observer : observers_)
+    observer.AdvertisementReleased(this);
 }
 
 }  // namespace bluez