InlinedVisitor: Migrate filesystem to use inlined tracing

Source/modules/filesystem/MetadataCallback.h

 /*
  * Copyright (C) 2010 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 22 matching lines @@
 
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Metadata;
 
 class MetadataCallback : public GarbageCollectedFinalized<MetadataCallback> {
 public:
     virtual ~MetadataCallback() { }
-    virtual void trace(Visitor*) { }
+    DEFINE_INLINE_VIRTUAL_TRACE() { }
     virtual void handleEvent(Metadata*) = 0;
 };
 
 } // namespace
 
 #endif // MetadataCallback_h