Reduce FOR_EACH_OBSERVER macro usage in chrome/browser

chrome/browser/app_controller_mac.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/app_controller_mac.h"
 
 #include <stddef.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 1556 matching lines @@
 }
 
 - (void)applicationDidChangeScreenParameters:(NSNotification*)notification {
   // During this callback the working area is not always already updated. Defer.
   [self performSelector:@selector(delayedScreenParametersUpdate)
              withObject:nil
              afterDelay:0];
 }
 
 - (void)delayedScreenParametersUpdate {
-  FOR_EACH_OBSERVER(ui::WorkAreaWatcherObserver, workAreaChangeObservers_,
-      WorkAreaChanged());
+  for (auto& observer : workAreaChangeObservers_)
+    observer.WorkAreaChanged();
 }
 
 - (BOOL)application:(NSApplication*)application
     willContinueUserActivityWithType:(NSString*)userActivityType {
   return [userActivityType isEqualToString:NSUserActivityTypeBrowsingWeb];
 }
 
 - (BOOL)application:(NSApplication*)application
     continueUserActivity:(NSUserActivity*)userActivity
       restorationHandler:(void (^)(NSArray*))restorationHandler {
@@ skipping 76 matching lines @@
 
 //---------------------------------------------------------------------------
 
 namespace app_controller_mac {
 
 bool IsOpeningNewWindow() {
   return g_is_opening_new_window;
 }
 
 }  // namespace app_controller_mac