Remove usage of FOR_EACH_OBSERVER macro in chromecast

chromecast/graphics/cast_vsync_settings.cc

 // Copyright 2016 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 "chromecast/graphics/cast_vsync_settings.h"
 
 namespace chromecast {
 namespace {
 base::LazyInstance<CastVSyncSettings> g_instance = LAZY_INSTANCE_INITIALIZER;
 }  // namespace
 
 // static
 CastVSyncSettings* CastVSyncSettings::GetInstance() {
   return g_instance.Pointer();
 }
 
 base::TimeDelta CastVSyncSettings::GetVSyncInterval() const {
   return interval_;
 }
 
 void CastVSyncSettings::SetVSyncInterval(base::TimeDelta interval) {
   if (interval_ == interval)
     return;
   interval_ = interval;
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnVSyncIntervalChanged(interval));
+  for (auto& observer : observers_)
+    observer.OnVSyncIntervalChanged(interval);
 }
 
 void CastVSyncSettings::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void CastVSyncSettings::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 // Default to 60fps until set otherwise
 CastVSyncSettings::CastVSyncSettings()
     : interval_(base::TimeDelta::FromMicroseconds(16666)) {}
 
 CastVSyncSettings::~CastVSyncSettings() = default;
 
 }  // namespace chromecast