InlinedVisitor: Migrate html to use inlined tracing

Source/core/html/imports/HTMLImportTreeRoot.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 "config.h"
 #include "core/html/imports/HTMLImportTreeRoot.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/StyleEngine.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 82 matching lines @@
 void HTMLImportTreeRoot::recalcTimerFired(Timer<HTMLImportTreeRoot>*)
 {
     ASSERT(m_document);
 
     do {
         m_recalcTimer.stop();
         HTMLImport::recalcTreeState(this);
     } while (m_recalcTimer.isActive());
 }
 
-void HTMLImportTreeRoot::trace(Visitor* visitor)
+DEFINE_TRACE(HTMLImportTreeRoot)
 {
     visitor->trace(m_document);
     visitor->trace(m_imports);
     HTMLImport::trace(visitor);
 }
 
 }