Move HTMLInputElement method argument defaults into IDL file

Source/core/html/HTMLInputElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * 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 62 matching lines @@
     // Sets the "allowed value step" defined in the HTML spec to the specified double pointer.
     // Returns false if there is no "allowed value step."
     bool getAllowedValueStep(Decimal*) const;
     StepRange createStepRange(AnyStepHandling) const;
 
     Decimal findClosestTickMarkValue(const Decimal&);
 
     // Implementations of HTMLInputElement::stepUp() and stepDown().
     void stepUp(int, ExceptionState&);
     void stepDown(int, ExceptionState&);
-    void stepUp(ExceptionState& exceptionState) { stepUp(1, exceptionState); }
-    void stepDown(ExceptionState& exceptionState) { stepDown(1, exceptionState); }
     // stepUp()/stepDown() for user-interaction.
     bool isSteppable() const;
 
     bool isTextButton() const;
 
     bool isRadioButton() const;
     bool isTextField() const;
     bool isSearchField() const;
     bool isInputTypeHidden() const;
     bool isPasswordField() const;
@@ skipping 299 matching lines @@
     RefPtrWillBeMember<InputTypeView> m_inputTypeView;
     // The ImageLoader must be owned by this element because the loader code assumes
     // that it lives as long as its owning element lives. If we move the loader into
     // the ImageInput object we may delete the loader while this element lives on.
     OwnPtrWillBeMember<HTMLImageLoader> m_imageLoader;
     OwnPtrWillBeMember<ListAttributeTargetObserver> m_listAttributeTargetObserver;
 };
 
 } //namespace
 #endif