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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #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> {
 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