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

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.idl

 /*
  * Copyright (C) 2009 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 27 matching lines @@
 typedef unsigned short GLushort;
 typedef unsigned long  GLuint;
 typedef unrestricted float GLfloat;
 typedef unrestricted float GLclampf;
 
 [
     // FIXME: [DoNotCheckConstants] should be applied to members and not need to
     // be put on implementing interface
     // DoNotCheckConstants, // need to put on implementing interface
     NoInterfaceObject, // Always used on target of 'implements'
-    GarbageCollected,
 ] interface WebGLRenderingContextBase {
 
     readonly attribute HTMLCanvasElement canvas;
 
     /* ClearBufferMask */
     const GLenum DEPTH_BUFFER_BIT               = 0x00000100;
     const GLenum STENCIL_BUFFER_BIT             = 0x00000400;
     const GLenum COLOR_BUFFER_BIT               = 0x00004000;
 
     /* BeginMode */
@@ skipping 641 matching lines @@
     void vertexAttrib3fv(GLuint indx, Float32Array values);
     void vertexAttrib3fv(GLuint indx, sequence<GLfloat> values);
     void vertexAttrib4f(GLuint indx, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
     void vertexAttrib4fv(GLuint indx, Float32Array values);
     void vertexAttrib4fv(GLuint indx, sequence<GLfloat> values);
     [CallWith=ScriptState] void vertexAttribPointer(GLuint indx, GLint size, GLenum type, GLboolean normalized,
                                                     GLsizei stride, GLintptr offset);
 
     void viewport(GLint x, GLint y, GLsizei width, GLsizei height);
 };