Issue 6526 - Use new v8::Message::GetLineNumber() API

src/JsError.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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 18 matching lines @@
   const v8::Local<v8::Value>& exception,
   const v8::Local<v8::Message>& message)
 {
   std::stringstream error;
   error << *v8::String::Utf8Value(isolate, exception);
   if (!message.IsEmpty())
   {
     error << " at ";
     error << *v8::String::Utf8Value(isolate, message->GetScriptResourceName());
     error << ":";
-    error << message->GetLineNumber();
+    auto lineNumber = message->GetLineNumber(isolate->GetCurrentContext());
+    if (lineNumber.IsJust())
+      error << lineNumber.FromJust();
+    else
+      error << "<unknown>";
   }
   return error.str();
 }