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

Source/modules/webdatabase/DatabaseClient.h

 /*
  * Copyright (C) 2013 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 13 matching lines @@
  * 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 DatabaseClient_h
 #define DatabaseClient_h
 
+#include "core/page/Page.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class Database;
 class ExecutionContext;
 class InspectorDatabaseAgent;
 class Page;
@@ skipping 16 matching lines @@
 
 private:
     InspectorDatabaseAgent* m_inspectorAgent;
 };
 
 void provideDatabaseClientTo(Page&, PassOwnPtrWillBeRawPtr<DatabaseClient>);
 
 } // namespace blink
 
 #endif // DatabaseClient_h