Issue 5013 - Use const JsValue and pass reference where applicable

src/JsEngine.cpp

Index: src/JsEngine.cpp
===================================================================
--- a/src/JsEngine.cpp
+++ b/src/JsEngine.cpp
@@ -181,17 +181,17 @@
 }
 
 void AdblockPlus::JsEngine::RemoveEventCallback(const std::string& eventName)
 {
   std::lock_guard<std::mutex> lock(eventCallbacksMutex);
   eventCallbacks.erase(eventName);
 }
 
-void AdblockPlus::JsEngine::TriggerEvent(const std::string& eventName, const AdblockPlus::JsValueList& params)
+void AdblockPlus::JsEngine::TriggerEvent(const std::string& eventName, const AdblockPlus::JsConstValueList& params)
 {
   EventCallback callback;
   {
     std::lock_guard<std::mutex> lock(eventCallbacksMutex);
     auto it = eventCallbacks.find(eventName);
     if (it == eventCallbacks.end())
       return;
     callback = it->second;
@@ -251,20 +251,20 @@
   std::weak_ptr<JsEngine>* data =
       static_cast<std::weak_ptr<JsEngine>*>(external->Value());
   JsEnginePtr result = data->lock();
   if (!result)
     throw std::runtime_error("Oops, our JsEngine is gone, how did that happen?");
   return result;
 }
 
-AdblockPlus::JsValueList AdblockPlus::JsEngine::ConvertArguments(const v8::Arguments& arguments)
+AdblockPlus::JsConstValueList AdblockPlus::JsEngine::ConvertArguments(const v8::Arguments& arguments)
 {
   const JsContext context(shared_from_this());
-  JsValueList list;
+  JsConstValueList list;
   for (int i = 0; i < arguments.Length(); i++)
     list.push_back(JsValuePtr(new JsValue(shared_from_this(), arguments[i])));
   return list;
 }
 
 AdblockPlus::FileSystemPtr AdblockPlus::JsEngine::GetFileSystem() const
 {
   return fileSystem;