Remove FOR_EACH_OBSERVER macro usage in chrome/browser/extensions

chrome/browser/extensions/api/cast_devices_private/cast_devices_private_api.cc

 // Copyright 2015 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/extensions/api/cast_devices_private/cast_devices_private_api.h"
 
 #include "base/lazy_instance.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/extensions/api/cast_devices_private.h"
 
@@ skipping 59 matching lines @@
   observer_list_.AddObserver(observer);
 }
 
 void CastDeviceUpdateListeners::RemoveObserver(
     ash::CastConfigDelegate::Observer* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
 void CastDeviceUpdateListeners::NotifyCallbacks(
     const ReceiverAndActivityList& devices) {
-  FOR_EACH_OBSERVER(ash::CastConfigDelegate::Observer, observer_list_,
-                    OnDevicesUpdated(devices));
+  for (auto& observer : observer_list_)
+    observer.OnDevicesUpdated(devices);
 }
 
 CastDevicesPrivateUpdateDevicesFunction::
     CastDevicesPrivateUpdateDevicesFunction() {}
 
 CastDevicesPrivateUpdateDevicesFunction::
     ~CastDevicesPrivateUpdateDevicesFunction() {}
 
 ExtensionFunction::ResponseAction
 CastDevicesPrivateUpdateDevicesFunction::Run() {
   auto params =
       api::cast_devices_private::UpdateDevices::Params::Create(*args_);
 
   CastDeviceUpdateListeners::ReceiverAndActivityList devices;
   for (const api::cast_devices_private::ReceiverActivity& device :
        params->devices) {
     devices.push_back(
         ConvertReceiverAndActivityType(device.receiver, device.activity.get()));
   }
 
   auto* listeners = CastDeviceUpdateListeners::Get(browser_context());
   listeners->NotifyCallbacks(devices);
 
   return RespondNow(NoArguments());
 }
 
 }  // namespace extensions