Remove usage of FOR_EACH_OBSERVER macro in device/

device/bluetooth/dbus/fake_bluetooth_media_client.cc

Index: device/bluetooth/dbus/fake_bluetooth_media_client.cc
diff --git a/device/bluetooth/dbus/fake_bluetooth_media_client.cc b/device/bluetooth/dbus/fake_bluetooth_media_client.cc
index 3b7a83b9a19a2c87f55ec8b3e82c7cb88424063f..7ca3a7a89ff21dc711167607f0efa4d1ed51e040 100644
--- a/device/bluetooth/dbus/fake_bluetooth_media_client.cc
+++ b/device/bluetooth/dbus/fake_bluetooth_media_client.cc
@@ -100,8 +100,8 @@ void FakeBluetoothMediaClient::SetVisible(bool visible) {
     SetEndpointRegistered(endpoints_.begin()->second, false);
 
   // Notifies observers about the change on |visible_|.
-  FOR_EACH_OBSERVER(BluetoothMediaClient::Observer, observers_,
-                    MediaRemoved(object_path_));
+  for (auto& observer : observers_)
+    observer.MediaRemoved(object_path_);
 }
 
 void FakeBluetoothMediaClient::SetEndpointRegistered(