ui/views: convert usage of FOR_EACH_OBSERVER macro

ui/views/win/windows_session_change_observer.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 "ui/views/win/windows_session_change_observer.h"
 
 #include <wtsapi32.h>
 
 #include <memory>
 
@@ skipping 35 matching lines @@
     observer_list_.RemoveObserver(observer);
   }
 
  private:
   friend struct base::DefaultSingletonTraits<
       WtsRegistrationNotificationManager>;
 
   void OnWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
     switch (message) {
       case WM_WTSSESSION_CHANGE:
-        FOR_EACH_OBSERVER(WindowsSessionChangeObserver,
-                          observer_list_,
-                          OnSessionChange(wparam));
+        for (WindowsSessionChangeObserver& observer : observer_list_)
+          observer.OnSessionChange(wparam);
         break;
       case WM_DESTROY:
         RemoveSingletonHwndObserver();
         break;
     }
   }
 
   void AddSingletonHwndObserver() {
     DCHECK(!singleton_hwnd_observer_);
     singleton_hwnd_observer_.reset(new gfx::SingletonHwndObserver(
@@ skipping 20 matching lines @@
       return;
 
     singleton_hwnd_observer_.reset(nullptr);
     // There is no race condition between this code and the worker thread.
     // RemoveSingletonHwndObserver is only called from two places:
     //   1) Destruction due to Singleton Destruction.
     //   2) WM_DESTROY fired by SingletonHwnd.
     // Under both cases we are in shutdown, which means no other worker threads
     // can be running.
     WTSUnRegisterSessionNotification(gfx::SingletonHwnd::GetInstance()->hwnd());
-    FOR_EACH_OBSERVER(WindowsSessionChangeObserver,
-                      observer_list_,
-                      ClearCallback());
+    for (WindowsSessionChangeObserver& observer : observer_list_)
+      observer.ClearCallback();
   }
 
   base::ObserverList<WindowsSessionChangeObserver, true> observer_list_;
   std::unique_ptr<gfx::SingletonHwndObserver> singleton_hwnd_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(WtsRegistrationNotificationManager);
 };
 
 WindowsSessionChangeObserver::WindowsSessionChangeObserver(
     const WtsCallback& callback)
@@ skipping 11 matching lines @@
 }
 
 void WindowsSessionChangeObserver::ClearCallback() {
   if (!callback_.is_null()) {
     callback_.Reset();
     WtsRegistrationNotificationManager::GetInstance()->RemoveObserver(this);
   }
 }
 
 }  // namespace views