Add support for dependent types in FOR_EACH_OBSERVER

base/observer_list.h

 // Copyright (c) 2011 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.
 
 #ifndef BASE_OBSERVER_LIST_H_
 #define BASE_OBSERVER_LIST_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 218 matching lines @@
   }
 
   bool might_have_observers() const {
     return ObserverListBase<ObserverType>::size() != 0;
   }
 };
 
 #define FOR_EACH_OBSERVER(ObserverType, observer_list, func)             \
   do {                                                                   \
     if ((observer_list).might_have_observers()) {                        \
-      base::ObserverListBase<ObserverType>::Iterator it_inside_observer_macro( \
-          &observer_list);                                               \
+      typename base::ObserverListBase<ObserverType>::Iterator            \
+          it_inside_observer_macro(&observer_list);                      \
       ObserverType* obs;                                                 \
       while ((obs = it_inside_observer_macro.GetNext()) != nullptr)      \
         obs->func;                                                       \
     }                                                                    \
   } while (0)
 
 }  // namespace base
 
 #endif  // BASE_OBSERVER_LIST_H_