Use C++11 range-based loop for core/clipboard, core/dom and core/testing

Source/core/dom/IdTargetObserverRegistry.cpp

 /*
  * Copyright (C) 2012 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 61 matching lines @@
 {
     ASSERT(!id.isEmpty());
     ASSERT(!m_registry.isEmpty());
 
     m_notifyingObserversInSet = m_registry.get(id.impl());
     if (!m_notifyingObserversInSet)
         return;
 
     WillBeHeapVector<RawPtrWillBeMember<IdTargetObserver> > copy;
     copyToVector(*m_notifyingObserversInSet, copy);
-    for (WillBeHeapVector<RawPtrWillBeMember<IdTargetObserver> >::const_iterator it = copy.begin(); it != copy.end(); ++it) {
-        if (m_notifyingObserversInSet->contains(*it))
-            (*it)->idTargetChanged();
+    for (const auto& observer : copy) {
+        if (m_notifyingObserversInSet->contains(observer))
+            observer->idTargetChanged();
     }
 
     if (m_notifyingObserversInSet->isEmpty())
         m_registry.remove(id.impl());
 
     m_notifyingObserversInSet = nullptr;
 }
 
 bool IdTargetObserverRegistry::hasObservers(const AtomicString& id) const
 {
     if (id.isEmpty() || m_registry.isEmpty())
         return false;
     ObserverSet* set = m_registry.get(id.impl());
     return set && !set->isEmpty();
 }
 
 } // namespace blink