Issue 5035 - Fix build on gcc 4.8

src/JsEngine.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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 83 matching lines @@
 
   auto timerTaskInfoIterator = timerTaskInfos.emplace(timerTaskInfos.end());
   timerTaskInfoIterator->delay = arguments[1]->IntegerValue();
 
   for (int i = 0; i < arguments.Length(); i++)
     timerTaskInfoIterator->arguments.emplace_back(new v8::Persistent<v8::Value>(GetIsolate(), arguments[i]));
   TimerTask retValue = { shared_from_this(), timerTaskInfoIterator };
   return retValue;
 }
 
-void JsEngine::CallTimerTask(TimerTaskInfos::const_iterator timerTaskInfoIterator)
+void JsEngine::CallTimerTask(TimerTaskInfos::iterator timerTaskInfoIterator)
 {
   const JsContext context(shared_from_this());
   JsValue callback(shared_from_this(), v8::Local<v8::Value>::New(GetIsolate(), *timerTaskInfoIterator->arguments[0]));
   JsConstValueList callbackArgs;
   for (int i = 2; i < timerTaskInfoIterator->arguments.size(); i++)
     callbackArgs.emplace_back(new JsValue(shared_from_this(),
     v8::Local<v8::Value>::New(GetIsolate(), *timerTaskInfoIterator->arguments[i])));
   callback.Call(callbackArgs);
   timerTaskInfos.erase(timerTaskInfoIterator);
 }
@@ skipping 200 matching lines @@
 
 
 void AdblockPlus::JsEngine::SetGlobalProperty(const std::string& name, 
                                               AdblockPlus::JsValuePtr value)
 {
   auto global = GetGlobalObject();
   if (!global)
     throw std::runtime_error("Global object cannot be null");
   global->SetProperty(name, value);
 }