Remove usage of FOR_EACH_OBSERVER macro in device/

device/bluetooth/dbus/bluetooth_media_client.cc

Index: device/bluetooth/dbus/bluetooth_media_client.cc
diff --git a/device/bluetooth/dbus/bluetooth_media_client.cc b/device/bluetooth/dbus/bluetooth_media_client.cc
index 3815bc8778c8ada5c4da81aa1f42be2fd9454375..3f6aa401f683900c1a7374c4a6217be025bcf856 100644
--- a/device/bluetooth/dbus/bluetooth_media_client.cc
+++ b/device/bluetooth/dbus/bluetooth_media_client.cc
@@ -73,15 +73,15 @@ class BluetoothMediaClientImpl : public BluetoothMediaClient,
   void ObjectAdded(const dbus::ObjectPath& object_path,
                    const std::string& interface_name) override {
     VLOG(1) << "Remote Media added: " << object_path.value();
-    FOR_EACH_OBSERVER(BluetoothMediaClient::Observer, observers_,
-                      MediaAdded(object_path));
+    for (auto& observer : observers_)
+      observer.MediaAdded(object_path);
   }
 
   void ObjectRemoved(const dbus::ObjectPath& object_path,
                      const std::string& interface_name) override {
     VLOG(1) << "Remote Media removed: " << object_path.value();
-    FOR_EACH_OBSERVER(BluetoothMediaClient::Observer, observers_,
-                      MediaRemoved(object_path));
+    for (auto& observer : observers_)
+      observer.MediaRemoved(object_path);
   }
 
   // BluetoothMediaClient overrides.