Revert of Make classes and structures in web fast-allocated.

Source/web/WebFileChooserCompletionImpl.h

 /*
  * Copyright (C) 2009 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 WebFileChooserCompletionImpl_h
 #define WebFileChooserCompletionImpl_h
 
 #include "platform/FileChooser.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebVector.h"
 #include "public/web/WebFileChooserCompletion.h"
-#include "wtf/FastAllocBase.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class WebFileChooserCompletionImpl final : public WebFileChooserCompletion {
-    WTF_MAKE_FAST_ALLOCATED(WebFileChooserCompletionImpl);
 public:
     explicit WebFileChooserCompletionImpl(PassRefPtr<FileChooser>);
     ~WebFileChooserCompletionImpl() override;
     void didChooseFile(const WebVector<WebString>& fileNames) override;
     void didChooseFile(const WebVector<SelectedFileInfo>& files) override;
 
 private:
     RefPtr<FileChooser> m_fileChooser;
 };
 
 } // namespace blink
 
 #endif