Get rid of dependencies on v8.h in public header files

src/JsEngine.cpp

 /*
  * 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 37 matching lines @@
 {
 }
 
 AdblockPlus::JsEnginePtr AdblockPlus::JsEngine::New(const AppInfo& appInfo)
 {
   JsEnginePtr result(new JsEngine());
 
   const v8::Locker locker(result->isolate);
   const v8::HandleScope handleScope;
 
-  result->context.reset(new v8::Persistent<v8::Context>(v8::Context::New()));
+  result->context.reset(result->isolate, v8::Context::New());
   AdblockPlus::GlobalJsObject::Setup(result, appInfo,
-      JsValuePtr(new JsValue(result, (*result->context)->Global())));
+      JsValuePtr(new JsValue(result, result->context->Global())));
   return result;
 }
 
 AdblockPlus::JsValuePtr AdblockPlus::JsEngine::Evaluate(const std::string& source,
     const std::string& filename)
 {
   const JsContext context(shared_from_this());
   const v8::TryCatch tryCatch;
   const v8::Handle<v8::Script> script = CompileScript(source, filename);
   CheckTryCatch(tryCatch);
@@ skipping 122 matching lines @@
   return logSystem;
 }
 
 void AdblockPlus::JsEngine::SetLogSystem(AdblockPlus::LogSystemPtr val)
 {
   if (!val)
     throw std::runtime_error("LogSystem cannot be null");
 
   logSystem = val;
 }