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 49 matching lines @@
   ASSERT_TRUE(value->AsBool());
 
   value = jsEngine->NewObject();
   ASSERT_TRUE(value->IsObject());
   ASSERT_EQ(0u, value->GetOwnPropertyNames().size());
 }
 
 TEST_F(JsEngineTest, EventCallbacks)
 {
   bool callbackCalled = false;
-  AdblockPlus::JsValueList callbackParams;
+  AdblockPlus::JsConstValueList callbackParams;
   auto Callback = [&callbackCalled, & callbackParams](
-    const AdblockPlus::JsValueList& params)
+    const AdblockPlus::JsConstValueList& params)
   {
     callbackCalled = true;
     callbackParams = params;
   };
 
   // Trigger event without a callback
   callbackCalled = false;
   jsEngine->Evaluate("_triggerEvent('foobar')");
   ASSERT_FALSE(callbackCalled);
 
@@ skipping 44 matching lines @@
 
 TEST(NewJsEngineTest, GlobalPropertyTest)
 {
   AdblockPlus::JsEnginePtr jsEngine(AdblockPlus::JsEngine::New());
   jsEngine->SetGlobalProperty("foo", jsEngine->NewValue("bar"));
   AdblockPlus::JsValuePtr foo = jsEngine->Evaluate("foo");
   ASSERT_TRUE(foo->IsString());
   ASSERT_EQ(foo->AsString(), "bar");
 }