Change the way persistent handles are desctructed. Add tests.

include/AdblockPlus/JsValue.h

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef ADBLOCK_PLUS_JS_VALUE_H
 #define ADBLOCK_PLUS_JS_VALUE_H
 
 #include <stdint.h>
 #include <string>
 #include <vector>
 #include "tr1_memory.h"
 #include "V8ValueHolder.h"
 
 namespace v8
 {
-  class Value;
   template<class T> class Handle;
 }
 
 namespace AdblockPlus
 {
   class JsValue;
   class JsEngine;
 
   typedef std::tr1::shared_ptr<JsValue> JsValuePtr;
   typedef std::vector<AdblockPlus::JsValuePtr> JsValueList;
@@ skipping 40 matching lines @@
   protected:
     JsValue(JsEnginePtr jsEngine, v8::Handle<v8::Value> value);
     void SetProperty(const std::string& name, v8::Handle<v8::Value> val);
 
     JsEnginePtr jsEngine;
     V8ValueHolder<v8::Value> value;
   };
 }
 
 #endif