Componentization: fix SupplementTracing<0>::~SupplementTracing<0>(void) already defined.

Source/platform/Supplementable.h

 /*
  * Copyright (C) 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
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  *
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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 #ifndef Supplementable_h
 #define Supplementable_h
 
+#include "platform/PlatformExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Assertions.h"
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 #if ENABLE(ASSERT)
 #include "wtf/Threading.h"
 #endif
@@ skipping 69 matching lines @@
     typedef PassOwnPtr<SupplementBase<T, false>> SupplementArgumentType;
 };
 
 template<bool>
 class SupplementTracing;
 
 template<>
 class SupplementTracing<true> : public GarbageCollectedMixin { };
 
 template<>
-class GC_PLUGIN_IGNORE("crbug.com/476419") SupplementTracing<false> {
+class GC_PLUGIN_IGNORE("crbug.com/476419") PLATFORM_EXPORT SupplementTracing<false> {

[tasak, 2015/04/22 03:14:48]

To fix SupplementTracing<0>::~SupplementTracing<0>(void) already defined,
blink_platform.dll should own SupplementTracing<0> instance.
So need to make SupplementTracing<0> PLATFORM_EXPORT.

 public:
     virtual ~SupplementTracing() { }
     // FIXME: Oilpan: this trace() method is only provided to minimize
     // the use of ENABLE(OILPAN) for Supplements deriving from the
     // transition type WillBeHeapSupplement<>.
     //
     // When that transition type is removed (or its use is substantially
     // reduced), remove this dummy trace method also.
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 };
@@ skipping 103 matching lines @@
 };
 
 template<typename T>
 struct ThreadingTrait<SupplementableBase<T, true>> {
     static const ThreadAffinity Affinity = ThreadingTrait<T>::Affinity;
 };
 
 } // namespace blink
 
 #endif // Supplementable_h