Oilpan: fix build after r189304 (6a1bbc3).

Source/web/PopupMenuImpl.cpp

 // Copyright (c) 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 "web/PopupMenuImpl.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/dom/StyleEngine.h"
@@ skipping 15 matching lines @@
 public:
     static PassRefPtrWillBeRawPtr<PopupMenuCSSFontSelector> create(Document* document, CSSFontSelector* ownerFontSelector)
     {
         return adoptRefWillBeNoop(new PopupMenuCSSFontSelector(document, ownerFontSelector));
     }
 
     // We don't override willUseFontData() for now because the old PopupListBox
     // only worked with fonts loaded when opening the popup.
     virtual PassRefPtr<FontData> getFontData(const FontDescription&, const AtomicString&) override;
 
+    virtual void trace(Visitor*) override;
+
 private:
     PopupMenuCSSFontSelector(Document* document, CSSFontSelector* ownerFontSelector)
         : CSSFontSelector(document)
-        , m_ownerFontSelector(ownerFontSelector) { }
+        , m_ownerFontSelector(ownerFontSelector)
+    {
+    }
+
     RefPtrWillBeMember<CSSFontSelector> m_ownerFontSelector;
 };
 
 PassRefPtr<FontData> PopupMenuCSSFontSelector::getFontData(const FontDescription& description, const AtomicString& name)
 {
     return m_ownerFontSelector->getFontData(description, name);
 }
 
+void PopupMenuCSSFontSelector::trace(Visitor* visitor)
+{
+    visitor->trace(m_ownerFontSelector);
+    CSSFontSelector::trace(visitor);
+}
+
 PassRefPtrWillBeRawPtr<PopupMenuImpl> PopupMenuImpl::create(ChromeClientImpl* chromeClient, PopupMenuClient* client)
 {
     return adoptRefWillBeNoop(new PopupMenuImpl(chromeClient, client));
 }
 
 PopupMenuImpl::PopupMenuImpl(ChromeClientImpl* chromeClient, PopupMenuClient* client)
     : m_chromeClient(chromeClient)
     , m_client(client)
     , m_popup(nullptr)
     , m_indexToSetOnClose(-1)
@@ skipping 232 matching lines @@
 #if ENABLE(OILPAN)
     // Cannot be done during finalization, so instead done when the
     // render object is destroyed and disconnected.
     //
     // FIXME: do this always, regardless of ENABLE(OILPAN).
     dispose();
 #endif
 }
 
 } // namespace blink