Reduce usage of FOR_EACH_OBSERVER macro in components/

components/pairing/fake_controller_pairing_controller.cc

Index: components/pairing/fake_controller_pairing_controller.cc
diff --git a/components/pairing/fake_controller_pairing_controller.cc b/components/pairing/fake_controller_pairing_controller.cc
index 24069e23776187716dfdaa0f58527aa3bc16ae94..2eca750bcf4af866c6edec6f85ed0d8063c2b9f1 100644
--- a/components/pairing/fake_controller_pairing_controller.cc
+++ b/components/pairing/fake_controller_pairing_controller.cc
@@ -233,7 +233,8 @@ void FakeControllerPairingController::ChangeStage(Stage new_stage) {
   if (current_stage_ == new_stage)
     return;
   current_stage_ = new_stage;
-  FOR_EACH_OBSERVER(Observer, observers_, PairingStageChanged(new_stage));
+  for (Observer& observer : observers_)
+    observer.PairingStageChanged(new_stage);
 }
 
 void FakeControllerPairingController::ChangeStageLater(Stage new_stage) {
@@ -277,13 +278,15 @@ void FakeControllerPairingController::DeviceFound(
     const std::string& device_id) {
   CHECK(current_stage_ == STAGE_DEVICES_DISCOVERY);
   discovered_devices_.insert(device_id);
-  FOR_EACH_OBSERVER(Observer, observers_, DiscoveredDevicesListChanged());
+  for (Observer& observer : observers_)
+    observer.DiscoveredDevicesListChanged();
 }
 
 void FakeControllerPairingController::DeviceLost(const std::string& device_id) {
   CHECK(current_stage_ == STAGE_DEVICES_DISCOVERY);
   discovered_devices_.erase(device_id);
-  FOR_EACH_OBSERVER(Observer, observers_, DiscoveredDevicesListChanged());
+  for (Observer& observer : observers_)
+    observer.DiscoveredDevicesListChanged();
 }
 
 void FakeControllerPairingController::PairingStageChanged(Stage new_stage) {