InlinedVisitor: Migrate html to use inlined tracing

Source/core/html/imports/HTMLImportLoader.h

 /*
  * 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 79 matching lines @@
 #endif
     void startLoading(const ResourcePtr<RawResource>&);
 
     // Tells the loader that all of the import's stylesheets finished
     // loading.
     // Called by Document::didRemoveAllPendingStylesheet.
     void didRemoveAllPendingStylesheet();
 
     PassRefPtrWillBeRawPtr<CustomElementSyncMicrotaskQueue> microtaskQueue() const;
 
-    virtual void trace(Visitor*) override;
+    DECLARE_VIRTUAL_TRACE();
 
 private:
     HTMLImportLoader(HTMLImportsController*);
 
     // RawResourceClient
     virtual void responseReceived(Resource*, const ResourceResponse&, PassOwnPtr<WebDataConsumerHandle>) override;
     virtual void dataReceived(Resource*, const char* data, unsigned length) override;
     virtual void notifyFinished(Resource*) override;
 
     // DocumentParserClient
@@ skipping 17 matching lines @@
     WillBeHeapVector<RawPtrWillBeMember<HTMLImportChild>> m_imports;
     State m_state;
     RefPtrWillBeMember<Document> m_document;
     RefPtrWillBeMember<DocumentWriter> m_writer;
     RefPtrWillBeMember<CustomElementSyncMicrotaskQueue> m_microtaskQueue;
 };
 
 } // namespace blink
 
 #endif // HTMLImportLoader_h