Issue 1550 - Get rid of V8ValueHolder.h

include/AdblockPlus/JsEngine.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 11 matching lines @@
 #include <map>
 #include <stdexcept>
 #include <stdint.h>
 #include <string>
 #include <AdblockPlus/AppInfo.h>
 #include <AdblockPlus/LogSystem.h>
 #include <AdblockPlus/FileSystem.h>
 #include <AdblockPlus/JsValue.h>
 #include <AdblockPlus/WebRequest.h>
 
-#include "V8ValueHolder.h"
-
 namespace v8
 {
   class Arguments;
   class Isolate;
   class Value;
   class Context;
   template<class T> class Handle;
   typedef Handle<Value>(*InvocationCallback)(const Arguments &args);
 }
 
@@ skipping 173 matching lines @@
      */
     void SetGlobalProperty(const std::string& name, AdblockPlus::JsValuePtr value);
 
   private:
     JsEngine();
 
     FileSystemPtr fileSystem;
     WebRequestPtr webRequest;
     LogSystemPtr logSystem;
     v8::Isolate* isolate;
-    V8ValueHolder<v8::Context> context;
+    std::unique_ptr<v8::Persistent<v8::Context>> context;
     EventMap eventCallbacks;
     JsValuePtr globalJsObject;
   };
 }
 
 #endif