Oilpan: fix build after r197039.

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/ElementTraversal.h"
@@ skipping 11 matching lines @@
 #include "platform/geometry/IntRect.h"
 #include "platform/text/PlatformLocale.h"
 #include "public/platform/Platform.h"
 #include "public/web/WebColorChooser.h"
 #include "web/ChromeClientImpl.h"
 #include "web/WebViewImpl.h"
 
 namespace blink {
 
 class PopupMenuCSSFontSelector : public CSSFontSelector, private CSSFontSelectorClient {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PopupMenuCSSFontSelector);
 public:
     static PassRefPtrWillBeRawPtr<PopupMenuCSSFontSelector> create(Document* document, CSSFontSelector* ownerFontSelector)
     {
         return adoptRefWillBeNoop(new PopupMenuCSSFontSelector(document, ownerFontSelector));
     }
 
     ~PopupMenuCSSFontSelector();
 
     // We don't override willUseFontData() for now because the old PopupListBox
     // only worked with fonts loaded when opening the popup.
@@ skipping 384 matching lines @@
 
 void PopupMenuImpl::disconnectClient()
 {
     m_client = nullptr;
     // Cannot be done during finalization, so instead done when the
     // layout object is destroyed and disconnected.
     dispose();
 }
 
 } // namespace blink