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

Source/core/dom/DocumentSupplementable.h

Index: Source/core/dom/DocumentSupplementable.h
diff --git a/Source/core/dom/DocumentSupplementable.h b/Source/core/dom/DocumentSupplementable.h
index 56649e303b628638bc66cfd1c35426848a554f83..712545f4572ad062c14934a6cceeed3fad498363 100644
--- a/Source/core/dom/DocumentSupplementable.h
+++ b/Source/core/dom/DocumentSupplementable.h
@@ -28,12 +28,16 @@
 #ifndef DocumentSupplementable_h
 #define DocumentSupplementable_h
 
+#include "core/CoreExport.h"
 #include "platform/Supplementable.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Document;
 
+extern template class CORE_TEMPLATE_EXPORT WillBeHeapSupplement<Document>;

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

To fix the following link errors:
webcore_shared.dll.lib(webcore_shared.dll) : error LNK2005: "public: void
__cdecl blink::SupplementableBase<class
blink::Document,0>::provideSupplement(char const *,class WTF::PassOwnPtr<class
blink::SupplementBase<class blink::Document,0> >)"
(?provideSupplement@?$SupplementableBase@VDocument@blink@@$0A@@blink@@QEAAXPEBDV?$PassOwnPtr@V?$SupplementBase@VDocument@blink@@$0A@@blink@@@WTF@@@Z)
already defined in modules.DeviceLightDispatcher.obj

webcore_shared.dll.lib(webcore_shared.dll) : error LNK2005: "public: class
blink::SupplementBase<class blink::Document,0> * __cdecl
blink::SupplementableBase<class blink::Document,0>::requireSupplement(char const
*)"
(?requireSupplement@?$SupplementableBase@VDocument@blink@@$0A@@blink@@QEAAPEAV?$SupplementBase@VDocument@blink@@$0A@@2@PEBD@Z)
already defined in modules.DeviceLightDispatcher.obj

we need this "extern template class".

+
 using DocumentSupplementable = WillBeHeapSupplementable<Document>;
 using DocumentSupplement = WillBeHeapSupplement<Document>;