Supplement should have a Member to the corresponding Supplementable object

third_party/WebKit/Source/core/frame/NavigatorLanguage.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NavigatorLanguage_h
 #define NavigatorLanguage_h
 
+#include "core/CoreExport.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
-class NavigatorLanguage {
+class CORE_EXPORT NavigatorLanguage {
  public:
   NavigatorLanguage();
 
   AtomicString language();
   virtual Vector<String> languages() = 0;
   bool hasLanguagesChanged();
   void setLanguagesChanged();
 
  private:
   bool m_languagesChanged;
 };
 
 }  // namespace blink
 
 #endif  // NavigatorLanguage_h