Remove tests for unused IDL compiler features

Source/bindings/tests/idls/TestObjectPython.idl

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 111 matching lines @@
     attribute float[] floatArrayAttribute;
     // Nullable attributes
     attribute DOMString? nullableStringAttribute;
     attribute long? nullableLongAttribute;
     // Enumerations
     attribute TestEnum testEnumAttribute;
     // Static attributes
     static attribute DOMString staticStringAttribute;
     static attribute long staticLongAttribute;
     // Constructors
-    // attribute attribute TestSubObjConstructor TestSubObj;
     attribute TestObjectAConstructor testObjectAConstructorAttribute;
     // Exceptional type
     attribute EventHandler eventHandlerAttribute;
 
     // Extended attributes
     [ActivityLogging=ForAllWorlds] attribute long activityLoggingAccessForAllWorldsLongAttribute;
     [ActivityLogging=GetterForAllWorlds] attribute long activityLoggingGetterForAllWorldsLongAttribute;
     [ActivityLogging=SetterForAllWorlds] attribute long activityLoggingSetterForAllWorldsLongAttribute;
     [CachedAttribute=isValueDirty] attribute any cachedAttributeAnyAttribute;
     [CallWith=ExecutionContext] attribute any callWithExecutionContextAnyAttribute;
@@ skipping 264 matching lines @@
     [RaisesException] void raisesExceptionVoidMethodOptionalTestCallbackInterfaceArg(optional TestCallbackInterface optionalTestCallbackInterfaceArg);
     [ReadOnly] void readOnlyVoidMethod();
     [NotEnumerable, ReadOnly] void notEnumerableReadOnlyVoidMethod();
     [RuntimeEnabled=FeatureName] void runtimeEnabledVoidMethod();
     [PerWorldBindings, RuntimeEnabled=FeatureName] void perWorldBindingsRuntimeEnabledVoidMethod();
     [StrictTypeChecking] void strictTypeCheckingVoidMethodTestInterfaceEmptyArg(TestInterfaceEmpty testInterfaceEmptyArg);
     [TreatReturnedNullStringAs=Null] DOMString treatReturnedNullStringAsNullStringMethod();
     [TreatReturnedNullStringAs=Undefined] DOMString treatReturnedNullStringAsUndefinedStringMethod();
     [Unforgeable] void unforgeableVoidMethod();
 };