ui/views: convert usage of FOR_EACH_OBSERVER macro

ui/views/win/windows_session_change_observer.cc

Index: ui/views/win/windows_session_change_observer.cc
diff --git a/ui/views/win/windows_session_change_observer.cc b/ui/views/win/windows_session_change_observer.cc
index ddbb3191ae30452d895e4a48a60e8b74c0b68fcd..d3663e5cc224b1e9b4bf8f323c94cb1051b3620e 100644
--- a/ui/views/win/windows_session_change_observer.cc
+++ b/ui/views/win/windows_session_change_observer.cc
@@ -53,9 +53,8 @@ class WindowsSessionChangeObserver::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();
@@ -96,9 +95,8 @@ class WindowsSessionChangeObserver::WtsRegistrationNotificationManager {
     // 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_;