Reduce FOR_EACH_OBSERVER macro usage in chrome/browser

chrome/browser/command_updater.cc

 // 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.
 
 #include "chrome/browser/command_updater.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 55 matching lines @@
     if (command)
       command->observers.RemoveObserver(observer);
   }
 }
 
 void CommandUpdater::UpdateCommandEnabled(int id, bool enabled) {
   Command* command = GetCommand(id, true);
   if (command->enabled == enabled)
     return;  // Nothing to do.
   command->enabled = enabled;
-  FOR_EACH_OBSERVER(CommandObserver, command->observers,
-                    EnabledStateChangedForCommand(id, enabled));
+  for (auto& observer : command->observers)
+    observer.EnabledStateChangedForCommand(id, enabled);
 }
 
 CommandUpdater::Command* CommandUpdater::GetCommand(int id, bool create) {
   bool supported = SupportsCommand(id);
   if (supported)
     return commands_[id].get();
 
   DCHECK(create);
   std::unique_ptr<Command>& entry = commands_[id];
   entry = base::MakeUnique<Command>();
   return entry.get();
 }