Use C++11 features in core/html

Source/core/html/HTMLFormControlElement.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 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 472 matching lines @@
     if (!client)
         return false;
 
     return client->isValidationMessageVisible(*this);
 }
 
 ValidationMessageClient* HTMLFormControlElement::validationMessageClient() const
 {
     Page* page = document().page();
     if (!page)
-        return 0;
+        return nullptr;
 
     return &page->validationMessageClient();
 }
 
-bool HTMLFormControlElement::checkValidity(WillBeHeapVector<RefPtrWillBeMember<HTMLFormControlElement> >* unhandledInvalidControls, CheckValidityEventBehavior eventBehavior)
+bool HTMLFormControlElement::checkValidity(WillBeHeapVector<RefPtrWillBeMember<HTMLFormControlElement>>* unhandledInvalidControls, CheckValidityEventBehavior eventBehavior)
 {
     if (!willValidate() || isValidElement())
         return true;
     if (eventBehavior != CheckValidityDispatchInvalidEvent)
         return false;
     // An event handler can deref this object.
     RefPtrWillBeRawPtr<HTMLFormControlElement> protector(this);
     RefPtrWillBeRawPtr<Document> originalDocument(document());
     bool needsDefaultAction = dispatchEvent(Event::createCancelable(EventTypeNames::invalid));
     if (needsDefaultAction && unhandledInvalidControls && inDocument() && originalDocument == document())
@@ skipping 83 matching lines @@
 }
 
 bool HTMLFormControlElement::isDefaultButtonForForm() const
 {
     return isSuccessfulSubmitButton() && form() && form()->defaultButton() == this;
 }
 
 HTMLFormControlElement* HTMLFormControlElement::enclosingFormControlElement(Node* node)
 {
     if (!node)
-        return 0;
+        return nullptr;
     return Traversal<HTMLFormControlElement>::firstAncestorOrSelf(*node);
 }
 
 String HTMLFormControlElement::nameForAutofill() const
 {
     String fullName = name();
     String trimmedName = fullName.stripWhiteSpace();
     if (!trimmedName.isEmpty())
         return trimmedName;
     fullName = getIdAttribute();
     trimmedName = fullName.stripWhiteSpace();
     return trimmedName;
 }
 
 void HTMLFormControlElement::setFocus(bool flag)
 {
     LabelableElement::setFocus(flag);
 
     if (!flag && wasChangedSinceLastFormControlChangeEvent())
         dispatchFormControlChangeEvent();
 }
 
 } // namespace blink