Remove custom code for MessageEvent.ports getter

Source/bindings/tests/idls/TestObject.idl

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary formstrArg, 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.
@@ skipping 198 matching lines @@
     [EnabledAtRuntime] attribute long enabledAtRuntimeAttr1;
     [EnabledAtRuntime=FeatureName] attribute long enabledAtRuntimeAttr2;
     // 'EnabledPerContext' methods and attributes.
     [EnabledPerContext] void enabledPerContextMethod1(long longArg);
     [EnabledPerContext=FeatureName] void enabledPerContextMethod2(long longArg);
     [EnabledPerContext] attribute long enabledPerContextAttr1;
     [EnabledPerContext=FeatureName] attribute long enabledPerContextAttr2;
 
     attribute float[]                   floatArray;
     attribute double[]                  doubleArray;
+    attribute MessagePort[]             messagePortArray;
 
     void methodWithUnsignedLongSequence(sequence<unsigned long> unsignedLongSequence);
     [RaisesException] DOMString[] stringArrayFunction(DOMString[] values);
     [RaisesException] DOMStringList domStringListFunction(DOMStringList values);
 
     [CheckSecurityForNode] readonly attribute Document contentDocument;
     [CheckSecurityForNode, RaisesException] SVGDocument getSVGDocument();
 
     void convert1([TreatReturnedNullStringAs=Null] TestNode value);
     void convert2([TreatReturnedNullStringAs=Undefined] TestNode value);
@@ skipping 71 matching lines @@
     [DeprecateAs=StaticReadonlyAttribute] static readonly attribute long deprecatedStaticReadOnlyAttr;
     [DeprecateAs=StaticAttribute] static attribute long deprecatedStaticAttr;
     [DeprecateAs=ReadonlyAttribute] readonly attribute long deprecatedReadonlyAttr;
     [DeprecateAs=Attribute] attribute long deprecatedAttr;
 
     [DeprecateAs=Method] void deprecatedMethod();
     [DeprecateAs=StaticMethod] static void deprecatedStaticMethod();
 
     [DeprecateAs=Constant] const unsigned short DEPRECATED_CONSTANT = 1;
 };