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

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 2013 matching lines @@
         return;
 
     for (Node* node = parentNode(); node; node = node->parentNode()) {
         if (WillBeHeapVector<OwnPtrWillBeMember<MutationObserverRegistration>>* registry = node->mutationObserverRegistry()) {
             const size_t size = registry->size();
             for (size_t i = 0; i < size; ++i)
                 registry->at(i)->observedSubtreeNodeWillDetach(*this);
         }
 
         if (WillBeHeapHashSet<RawPtrWillBeMember<MutationObserverRegistration>>* transientRegistry = node->transientMutationObserverRegistry()) {
-            for (WillBeHeapHashSet<RawPtrWillBeMember<MutationObserverRegistration>>::iterator iter = transientRegistry->begin(); iter != transientRegistry->end(); ++iter)
-                (*iter)->observedSubtreeNodeWillDetach(*this);
+            for (auto& registration : *transientRegistry)
+                registration->observedSubtreeNodeWillDetach(*this);
         }
     }
 }
 
 void Node::handleLocalEvents(Event& event)
 {
     if (!hasEventTargetData())
         return;
 
     if (isDisabledFormControl(this) && event.isMouseEvent())
@@ skipping 414 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif