Remove tests for unused IDL compiler features

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 22 matching lines @@
 enum TestEnumType { "", "EnumValue1", "EnumValue2", "EnumValue3" };
 
 callback TestCallbackFunction = void (TestEnumType formal1, TestObject formal2);
 
 [
     ImplementedAs=TestObj
 ] interface TestObject : EventTarget {
     // Attributes
     readonly attribute long            readOnlyLongAttr;
     readonly attribute DOMString       readOnlyStringAttr;
-    readonly attribute TestObject         readOnlyTestObjectAttr;
+    readonly attribute TestObject      readOnlyTestObjectAttr;
     static readonly attribute long     staticReadOnlyLongAttr;
     static attribute DOMString         staticStringAttr;
-    static readonly attribute TestSubObjConstructor TestSubObj;
+    attribute TestSubObjConstructor    TestSubObj;
     attribute TestEnumType             enumAttr;
     readonly attribute TestEnumType    readOnlyEnumAttr;
     attribute byte                     byteAttr;
     attribute octet                    octetAttr;
     attribute short                    shortAttr;
     attribute unsigned short           unsignedShortAttr;
     attribute long                     longAttr;
     attribute long long                longLongAttr;
     attribute unsigned long long       unsignedLongLongAttr;
     attribute DOMString                stringAttr;
@@ skipping 244 matching lines @@
     [DeprecateAs=Constant] const unsigned short DEPRECATED_CONSTANT = 1;
 
     // PutForwards
     [PutForwards=href] readonly attribute TestNode location;
     [PutForwards=hrefThrows] readonly attribute TestNode locationWithException;
 };
 
 // The following comment should not generate any code
 // TestObject implements TestImplements;