InlinedVisitor: Migrate page to use inlined tracing

Source/core/page/CustomContextMenuProvider.h

 // 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.
 
 #ifndef CustomContextMenuProvider_h
 #define CustomContextMenuProvider_h
 
 #include "core/page/ContextMenuProvider.h"
 #include "platform/ContextMenuItem.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class ContextMenu;
 class HTMLElement;
 class HTMLMenuElement;
 class HTMLMenuItemElement;
 
 class CustomContextMenuProvider final : public ContextMenuProvider {
 public:
     virtual ~CustomContextMenuProvider();
 
     static PassRefPtrWillBeRawPtr<CustomContextMenuProvider> create(HTMLMenuElement& menu, HTMLElement& subject)
     {
         return adoptRefWillBeNoop(new CustomContextMenuProvider(menu, subject));
     }
 
-    virtual void trace(Visitor*);
+    DECLARE_VIRTUAL_TRACE();
 
 private:
     CustomContextMenuProvider(HTMLMenuElement&, HTMLElement&);
 
     virtual void populateContextMenu(ContextMenu*) override;
     virtual void contextMenuItemSelected(const ContextMenuItem*) override;
     virtual void contextMenuCleared() override;
     void populateContextMenuItems(const HTMLMenuElement&, ContextMenu&);
     void appendSeparator(ContextMenu&);
     void appendMenuItem(HTMLMenuItemElement*, ContextMenu&);
     HTMLElement* menuItemAt(unsigned menuId);
 
     RefPtrWillBeMember<HTMLMenuElement> m_menu;
     RefPtrWillBeMember<HTMLElement> m_subjectElement;
     WillBeHeapVector<RefPtrWillBeMember<HTMLElement>> m_menuItems;
 };
 
 } // namespace blink
 
 #endif