Support indexed setter generation

Source/core/storage/Storage.idl

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
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 [
     CustomEnumerateProperty,
 ] interface Storage {
     [RaisesException, ImplementedAs=anonymousIndexedGetter] getter DOMString(unsigned long index);
+    [RaisesException, ImplementedAs=anonymousIndexedSetter] setter DOMString (unsigned long index, DOMString value);
     [ImplementedAs=anonymousIndexedDeleter, RaisesException] deleter boolean (unsigned long index);
-    [Custom] setter boolean (unsigned long index, DOMString value);
     [RaisesException, ImplementedAs=anonymousNamedGetter] getter DOMString(DOMString name);
     [RaisesException, ImplementedAs=anonymousNamedSetter] setter DOMString(DOMString name, DOMString value);
     [ImplementedAs=anonymousNamedDeleter, RaisesException] deleter boolean (DOMString name);
     [NotEnumerable, GetterRaisesException] readonly attribute unsigned long length;
     [NotEnumerable, TreatReturnedNullStringAs=Null, RaisesException] DOMString key(unsigned long index);
     [NotEnumerable, TreatReturnedNullStringAs=Null, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds, RaisesException] DOMString getItem(DOMString key);
     [NotEnumerable, RaisesException, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds] void setItem(DOMString key, DOMString data);
     [NotEnumerable, RaisesException, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds] void removeItem(DOMString key);
     [NotEnumerable, RaisesException, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds] void clear();
 };