Make [TypeChecking=Interface] the default

third_party/WebKit/Source/core/dom/DOMMatrix.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // http://dev.w3.org/fxtf/geometry/#DOMMatrix
 
 [
     Constructor,
     Constructor(DOMMatrixReadOnly other),
     // FIXME: Should implement more constructors (See: crbug.com/388780)
     // FIXME: Exposed=(Window,Worker)
     RuntimeEnabled=GeometryInterfaces,
+    LegacyInterfaceTypeChecking,
 ] interface DOMMatrix : DOMMatrixReadOnly {
     // These attributes are simple aliases for certain elements of the 4x4 matrix
     inherit attribute unrestricted double a;
     inherit attribute unrestricted double b;
     inherit attribute unrestricted double c;
     inherit attribute unrestricted double d;
     inherit attribute unrestricted double e;
     inherit attribute unrestricted double f;
 
     inherit attribute unrestricted double m11;
@@ skipping 27 matching lines @@
                           optional unrestricted double originX = 0,
                           optional unrestricted double originY = 0,
                           optional unrestricted double originZ = 0);
     DOMMatrix scaleNonUniformSelf(unrestricted double scaleX,
                                   optional unrestricted double scaleY = 1,
                                   optional unrestricted double scaleZ = 1,
                                   optional unrestricted double originX = 0,
                                   optional unrestricted double originY = 0,
                                   optional unrestricted double originZ = 0);
 };