Fix domain whitelisting and remove unused code

src/plugin/PluginSettings.h

 /**
 * This class contains all client functionality of the IE plugin
 *
 * Exception errors are tested by calls to ExceptionsTest from: Main ...
 */
 
 #ifndef _PLUGIN_SETTINGS_H_
 #define _PLUGIN_SETTINGS_H_
 
 
@@ skipping 190 matching lines @@
 
 private:
   std::vector<std::string> m_whitelistedDomains;
 
   void ClearWhitelist();
   bool ReadWhitelist(bool bDebug=true);
 
 public:
   void AddWhiteListedDomain(const CString& domain);
   void RemoveWhiteListedDomain(const CString& domain);
-  bool IsWhiteListedDomain(const CString& domain) const;
   int GetWhiteListedDomainCount() const;
   std::vector<std::string> GetWhiteListedDomainList();
 #endif //SUPPORT_WHITELIST
 
   bool RefreshWhitelist();
   DWORD GetWindowsBuildNumber();
 
   void SetSubscription(BSTR language);
   void SetSubscription(std::string language);
   void SetDefaultSubscription();
   CString GetSubscription();
   void RefreshFilterlist();
 
   std::vector<SubscriptionDescription> m_subscriptions;
 };
 
 
 #endif // _PLUGIN_SETTINGS_H_