Remove FOR_EACH_OBSERVER macro usage in chrome/browser/ui

chrome/browser/ui/views/frame/immersive_mode_controller.cc

 // Copyright 2013 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 "chrome/browser/ui/views/frame/immersive_mode_controller.h"
 
 ImmersiveModeController::ImmersiveModeController(Type type) : type_(type) {}
 
 ImmersiveModeController::~ImmersiveModeController() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnImmersiveModeControllerDestroyed());
+  for (Observer& observer : observers_)
+    observer.OnImmersiveModeControllerDestroyed();
 }
 
 void ImmersiveModeController::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void ImmersiveModeController::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }