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

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

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Apple Inc. 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 // http://www.w3.org/TR/SVG2/coords.html#InterfaceSVGTransform
 
 [
     ImplementedAs=SVGTransformTearOff,
     SetWrapperReferenceTo(SVGElement contextElement),
-    GarbageCollected,
 ] interface SVGTransform {
     // Transform Types
     const unsigned short SVG_TRANSFORM_UNKNOWN = 0;
     const unsigned short SVG_TRANSFORM_MATRIX = 1;
     const unsigned short SVG_TRANSFORM_TRANSLATE = 2;
     const unsigned short SVG_TRANSFORM_SCALE = 3;
     const unsigned short SVG_TRANSFORM_ROTATE = 4;
     const unsigned short SVG_TRANSFORM_SKEWX = 5;
     const unsigned short SVG_TRANSFORM_SKEWY = 6;
 
     [ImplementedAs=transformType] readonly attribute unsigned short type;
     // TODO(philipj): SVGMatrix should be DOMMatrixReadOnly.
     readonly attribute SVGMatrix matrix;
     readonly attribute float angle;
 
     [RaisesException] void setMatrix(SVGMatrix matrix);
     [RaisesException] void setTranslate(float tx, float ty);
     [RaisesException] void setScale(float sx, float sy);
     [RaisesException] void setRotate(float angle, float cx, float cy);
     [RaisesException] void setSkewX(float angle);
     [RaisesException] void setSkewY(float angle);
 };