Oilpan: LinkLoaderClient must be a GC mixin.

third_party/WebKit/Source/core/loader/LinkLoaderClient.h

 /*
  * Copyright (C) 2011 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 #ifndef LinkLoaderClient_h
 #define LinkLoaderClient_h
 
 #include "core/CoreExport.h"
 
 namespace blink {
 
-class CORE_EXPORT LinkLoaderClient {
+class CORE_EXPORT LinkLoaderClient : public WillBeGarbageCollectedMixin {
 public:
     virtual ~LinkLoaderClient() { }
+    DEFINE_INLINE_VIRTUAL_TRACE() { }
 
     virtual bool shouldLoadLink() = 0;
 
     virtual void linkLoaded() = 0;
     virtual void linkLoadingErrored() = 0;
     // There is no notification for cancellation.
 
     virtual void didStartLinkPrerender() = 0;
     virtual void didStopLinkPrerender() = 0;
     virtual void didSendLoadForLinkPrerender() = 0;
     virtual void didSendDOMContentLoadedForLinkPrerender() = 0;
 };
 
 }
 
 #endif