Issue 5013 - Make parameter const ref when applicable.

src/GlobalJsObject.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 50 matching lines @@
       return v8::ThrowException(Utils::ToV8String(isolate,
       "_triggerEvent expects at least one parameter"));
     }
     std::string eventName = converted.front()->AsString();
     converted.erase(converted.begin());
     jsEngine->TriggerEvent(eventName, converted);
     return v8::Undefined();
   }
 }
 
-JsValuePtr GlobalJsObject::Setup(JsEnginePtr jsEngine, const AppInfo& appInfo,
-    JsValuePtr obj)
+JsValuePtr GlobalJsObject::Setup(const JsEnginePtr& jsEngine, const AppInfo& appInfo,
+    const JsValuePtr& obj)
 {
   obj->SetProperty("setTimeout", jsEngine->NewCallback(::SetTimeoutCallback));
   obj->SetProperty("_triggerEvent", jsEngine->NewCallback(::TriggerEventCallback));
   obj->SetProperty("_fileSystem",
       FileSystemJsObject::Setup(jsEngine, jsEngine->NewObject()));
   obj->SetProperty("_webRequest",
       WebRequestJsObject::Setup(jsEngine, jsEngine->NewObject()));
   obj->SetProperty("console",
       ConsoleJsObject::Setup(jsEngine, jsEngine->NewObject()));
   obj->SetProperty("_appInfo",
       AppInfoJsObject::Setup(jsEngine, appInfo, jsEngine->NewObject()));
   return obj;
 }