Clean up and fix Utils::ToUTF8String() and Utils::ToUTF16String()

src/Utils.h

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 10 matching lines @@
 #include <v8.h>
 
 namespace AdblockPlus
 {
   namespace Utils
   {
     std::string Slurp(std::ios& stream);
     std::string FromV8String(v8::Handle<v8::Value> value);
     v8::Local<v8::String> ToV8String(const std::string& str);
 #ifdef _WIN32
-    std::wstring ToUTF16String(const std::string& str, unsigned long length);
-    std::string ToUTF8String(const std::wstring& str, unsigned long length);
+    std::wstring ToUTF16String(const std::string& str);
+    std::string ToUTF8String(const std::wstring& str);
     std::wstring CanonizeUrl(const std::wstring url);
     std::wstring TrimString(std::wstring text);
 #endif
   }
 }
 
 #endif