Support ignorance of base class finalizers.

tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.cpp

 // 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.
 
 #include "class_requires_finalization_base.h"
 
 namespace WebCore {
 
 void NeedsFinalizer::trace(Visitor* visitor)
 {
     A::trace(visitor);
 }
 
 void DoesNotNeedFinalizer::trace(Visitor* visitor)
 {
     A::trace(visitor);
 }
 
+void GCedClassWithAScriptWrappableBase::trace(Visitor* visitor)
+{
+    A::trace(visitor);
 }
+
+void GCedClassWithAScriptWrappableAndAFinalizableBase::trace(Visitor* visitor)
+{
+    A::trace(visitor);
+    GCedClassWithAScriptWrappableBase::trace(visitor);
+}
+
+}