Issue 5013 - Use const JsValue and pass reference where applicable

test/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 110 matching lines @@
   ASSERT_TRUE(jsEngine->GetWebRequest());
   ASSERT_ANY_THROW(jsEngine->SetWebRequest(AdblockPlus::WebRequestPtr()));
   AdblockPlus::WebRequestPtr webRequest(new AdblockPlus::DefaultWebRequest());
   jsEngine->SetWebRequest(webRequest);
   ASSERT_EQ(webRequest, jsEngine->GetWebRequest());
 }
 
 TEST(NewJsEngineTest, GlobalPropertyTest)
 {
   AdblockPlus::JsEnginePtr jsEngine(AdblockPlus::JsEngine::New());
-  jsEngine->SetGlobalProperty("foo", *jsEngine->NewValue("bar"));
+  jsEngine->SetGlobalProperty("foo", jsEngine->NewValue("bar"));
   AdblockPlus::JsValuePtr foo = jsEngine->Evaluate("foo");
   ASSERT_TRUE(foo->IsString());
   ASSERT_EQ(foo->AsString(), "bar");
 }