vcl: I18nHelper: delete unused GetDate() method

vcl/inc/vcl/i18nhelp.hxx

@@ -86,7 +86,6 @@ public:
     sal_Bool    MatchString( const String& rStr1, const String& rStr2 ) const;
     sal_Bool    MatchMnemonic( const String& rString, sal_Unicode cMnemonicChar ) const;
 
-    String      GetDate( const Date& rDate ) const;
     String      GetNum( long nNumber, sal_uInt16 nDecimals, sal_Bool bUseThousandSep = sal_True, sal_Bool bTrailingZeros = sal_True ) const;
 
     static String filterFormattingChars( const String& );

vcl/source/app/i18nhelp.cxx

@@ -175,13 +175,6 @@ sal_Bool vcl::I18nHelper::MatchMnemonic( const String& rString, sal_Unicode cMne
 }
 
 
-String vcl::I18nHelper::GetDate( const Date& rDate ) const
-{
-    ::osl::Guard< ::osl::Mutex > aGuard( ((vcl::I18nHelper*)this)->maMutex );
-
-    return ImplGetLocaleDataWrapper().getDate( rDate );
-}
-
 String vcl::I18nHelper::GetNum( long nNumber, sal_uInt16 nDecimals, sal_Bool bUseThousandSep, sal_Bool bTrailingZeros ) const
 {
     return ImplGetLocaleDataWrapper().getNum( nNumber, nDecimals, bUseThousandSep, bTrailingZeros );