[bindings] Remove custom setter used in CSSStyleDeclaration

Source/core/css/CSSStyleDeclaration.idl

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 27 matching lines @@
     // void setPropertyValue(DOMString property, [TreatNullAs=EmptyString] DOMString value);
     // void setPropertyPriority(DOMString property, [TreatNullAs=EmptyString] DOMString priority);
     [RaisesException] DOMString? removeProperty(DOMString property);
     readonly attribute CSSRule? parentRule;
     // [TreatNullAs=EmptyString] attribute DOMString cssFloat;
 
     // The camel-cased and dashed attribute getters have custom bindings.
     // http://dev.w3.org/csswg/cssom/#dom-cssstyledeclaration-camel-cased-attribute
     // http://dev.w3.org/csswg/cssom/#dom-cssstyledeclaration-dashed-attribute
     [Custom=(PropertyGetter,PropertyEnumerator,PropertyQuery)] getter (DOMString or float) (DOMString name);
-    [Custom] setter void (DOMString property, DOMString? propertyValue);
+    [CallWith=ScriptState, RaisesException] setter void (DOMString property, DOMString? propertyValue);
 };