Issue #3158276 by Hardik_Patel_12, kiamlaluno, paulocs: Remove local unused...

Issue #3158276 by Hardik_Patel_12, kiamlaluno, paulocs: Remove local unused variables from RequestFormatRouteFilterTest.php file

(cherry picked from commit 87713ec20ee7e000687fd890f00781a8145aa2f9)

core/tests/Drupal/Tests/Core/Routing/RequestFormatRouteFilterTest.php

@@ -35,9 +35,9 @@ public function testFilter(RouteCollection $collection, $request_format, array $
 
   public function filterProvider() {
     $route_without_format = new Route('/test');
-    $route_with_format = $route = new Route('/test');
+    $route_with_format = new Route('/test');
     $route_with_format->setRequirement('_format', 'json');
-    $route_with_multiple_formats = $route = new Route('/test');
+    $route_with_multiple_formats = new Route('/test');
     $route_with_multiple_formats->setRequirement('_format', 'json|xml');
 
     $collection = new RouteCollection();
@@ -71,7 +71,7 @@ public function testNoRouteFound() {
     \Drupal::setContainer($container);
 
     $collection = new RouteCollection();
-    $route_with_format = $route = new Route('/test');
+    $route_with_format = new Route('/test');
     $route_with_format->setRequirement('_format', 'json');
     $collection->add('test_0', $route_with_format);
     $collection->add('test_1', clone $route_with_format);
@@ -102,7 +102,7 @@ public function testNoRouteFoundWhenNoRequestFormatAndSingleRouteWithMultipleFor
     \Drupal::setContainer($container);
 
     $collection = new RouteCollection();
-    $route_with_format = $route = new Route('/test');
+    $route_with_format = new Route('/test');
     $route_with_format->setRequirement('_format', 'json|xml');
     $collection->add('sole_route_multiple_formats', $route_with_format);