Have bindings layer assume and insist that all interface types are GCed.

third_party/WebKit/Source/core/svg/SVGLengthList.idl

 /*
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 // http://www.w3.org/TR/SVG2/types.html#InterfaceSVGLengthList
 
 [
     ImplementedAs=SVGLengthListTearOff,
     SetWrapperReferenceTo(SVGElement contextElement),
-    GarbageCollected,
 ] interface SVGLengthList {
     readonly attribute unsigned long length;
     [ImplementedAs=length] readonly attribute unsigned long numberOfItems;
 
     [RaisesException] void clear();
     [RaisesException] SVGLength initialize(SVGLength newItem);
     [RaisesException] getter SVGLength getItem(unsigned long index);
     [RaisesException] SVGLength insertItemBefore(SVGLength newItem, unsigned long index);
     [RaisesException] SVGLength replaceItem(SVGLength newItem, unsigned long index);
     [RaisesException] SVGLength removeItem(unsigned long index);
     [RaisesException] SVGLength appendItem(SVGLength newItem);
     [RaisesException] setter void (unsigned long index, SVGLength newItem);
 };