Set element value to its default value on reset

Source/core/html/HTMLInputElement.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.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
@@ skipping 821 matching lines @@
 }
 
 String HTMLInputElement::resultForDialogSubmit()
 {
     return m_inputType->resultForDialogSubmit();
 }
 
 void HTMLInputElement::resetImpl()
 {
     if (m_inputType->storesValueSeparateFromAttribute()) {
-        setValue(String());
+        setValue(defaultValue());

[tkent, 2014/10/29 00:28:29]

This is a wrong fix.
Setting a null string to the value means the value refers to the default value. 
This change breaks the long-standing assumption.

         setNeedsValidityCheck();
     }
 
     setChecked(hasAttribute(checkedAttr));
     m_reflectsCheckedAttribute = true;
 }
 
 bool HTMLInputElement::isTextField() const
 {
     return m_inputType->isTextField();
@@ skipping 994 matching lines @@
 {
     listAttributeTargetChanged();
 }
 
 AXObject* HTMLInputElement::popupRootAXObject()
 {
     return m_inputTypeView->popupRootAXObject();
 }
 
 } // namespace