Issue #4692 - Rewrite web request task to avoid engine self-reference

src/Value.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
+ * 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/>.
+ */
+
+/**
+ * \file Value.h Validate and convert between v8 and standard types
+ */
+#if !defined(VALUE_H)
+#define VALUE_H
+
+#include <tuple>
+#include <string>
+#include <v8.h>
+
+std::tuple<bool, std::string> ConvertString(v8::Local<v8::Value> v8value);
+void SetPropertyOnV8Object(v8::Isolate* isolate, v8::Local<v8::Object>& target, const std::string& propertyName, const v8::Handle<v8::Value>& propertyValue);
+void SetPropertyOnV8Object(v8::Isolate* isolate, v8::Local<v8::Object>& target, const std::string& propertyName, const std::string& propertyValue);
+void SetPropertyOnV8Object(v8::Isolate* isolate, v8::Local<v8::Object>& target, const std::string& propertyName, int64_t propertyValue);
+
+
+#endif