Remove base::ObserverList<T>::Iter::GetNext().

base/observer_list_threadsafe.h

Index: base/observer_list_threadsafe.h
diff --git a/base/observer_list_threadsafe.h b/base/observer_list_threadsafe.h
index 49dc859f8f9d1dd72533f81a899e6c24cf50e7de..eb15cd4f4879af60498b33f66acc255235d0b088 100644
--- a/base/observer_list_threadsafe.h
+++ b/base/observer_list_threadsafe.h
@@ -222,11 +222,8 @@ class ObserverListThreadSafe
         return;
     }
 
-    {
-      typename ObserverList<ObserverType>::Iterator it(&context->list);
-      ObserverType* obs;
-      while ((obs = it.GetNext()) != nullptr)
-        method.Run(obs);
+    for (auto& observer : context->list) {
+      method.Run(&observer);
     }
 
     // If there are no more observers on the list, we can now delete it.