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

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

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 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/coords.html#InterfaceSVGPreserveAspectRatio
 
 [
     ImplementedAs=SVGPreserveAspectRatioTearOff,
     SetWrapperReferenceTo(SVGElement contextElement),
-    GarbageCollected,
 ] interface SVGPreserveAspectRatio {
     // Alignment types
     const unsigned short SVG_PRESERVEASPECTRATIO_UNKNOWN = 0;
     const unsigned short SVG_PRESERVEASPECTRATIO_NONE = 1;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMIN = 2;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMIN = 3;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMIN = 4;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMID = 5;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMID = 6;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMID = 7;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMAX = 8;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMAX = 9;
     const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMAX = 10;
 
     // Meet-or-slice types
     const unsigned short SVG_MEETORSLICE_UNKNOWN = 0;
     const unsigned short SVG_MEETORSLICE_MEET = 1;
     const unsigned short SVG_MEETORSLICE_SLICE = 2;
 
     [RaisesException=Setter] attribute unsigned short align;
     [RaisesException=Setter] attribute unsigned short meetOrSlice;
 };