Rename DrupalApp back to DrupalKernel, since it implements HttpKernelInterface.

core/lib/Drupal/Core/DrupalApp.php → core/lib/Drupal/Core/DrupalKernel.php

@@ -29,7 +29,7 @@
 /**
  * The DrupalApp class is the core of Drupal itself.
  */
-class DrupalApp implements HttpKernelInterface {
+class DrupalKernel implements HttpKernelInterface {
 
   /**
    *

index.php

 <?php
 
-use Drupal\Core\DrupalApp;
+use Drupal\Core\DrupalKernel;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
@@ -26,5 +26,5 @@
 // A request object from the HTTPFoundation to tell us about the request.
 $request = Request::createFromGlobals();
 
-$kernel = new DrupalApp();
+$kernel = new DrupalKernel();
 $kernel->handle($request)->send();