Use C++11 features in core/html

Source/core/html/HTMLOptionElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility, Inc.  All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 143 matching lines @@
 int HTMLOptionElement::index() const
 {
     // It would be faster to cache the index, but harder to get it right in all cases.
 
     HTMLSelectElement* selectElement = ownerSelectElement();
     if (!selectElement)
         return 0;
 
     int optionIndex = 0;
 
-    const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& items = selectElement->listItems();
+    const WillBeHeapVector<RawPtrWillBeMember<HTMLElement>>& items = selectElement->listItems();
     size_t length = items.size();
     for (size_t i = 0; i < length; ++i) {
         if (!isHTMLOptionElement(*items[i]))
             continue;
         if (items[i].get() == this)
             return optionIndex;
         ++optionIndex;
     }
 
     return 0;
@@ skipping 195 matching lines @@
             node = NodeTraversal::next(*node, this);
     }
     return text.toString();
 }
 
 HTMLFormElement* HTMLOptionElement::form() const
 {
     if (HTMLSelectElement* selectElement = ownerSelectElement())
         return selectElement->formOwner();
 
-    return 0;
+    return nullptr;
 }
 
 void HTMLOptionElement::didAddUserAgentShadowRoot(ShadowRoot& root)
 {
     updateLabel();
 }
 
 void HTMLOptionElement::updateLabel()
 {
     if (ShadowRoot* root = userAgentShadowRoot())
@@ skipping 20 matching lines @@
         ASSERT(parent);
         if (isHTMLOptGroupElement(*parent)) {
             RenderStyle* parentStyle = parent->renderStyle() ? parent->renderStyle() : parent->computedStyle();
             return !parentStyle || parentStyle->display() == NONE;
         }
     }
     return m_style->display() == NONE;
 }
 
 } // namespace blink