diff --git a/core/modules/rest/src/Tests/UpdateTest.php b/core/modules/rest/src/Tests/UpdateTest.php
index 8d52f0e..c72ba30 100644
--- a/core/modules/rest/src/Tests/UpdateTest.php
+++ b/core/modules/rest/src/Tests/UpdateTest.php
@@ -166,7 +166,6 @@ public function testPatchUpdate() {
    * Tests several valid and invalid update requests for the 'user' entity type.
    */
   public function testUpdateUser() {
-    $this->guzzle = TRUE;
     $serializer = $this->container->get('serializer');
     $entity_type = 'user';
     // Enables the REST service for 'user' entity type.
@@ -204,6 +203,7 @@ public function testUpdateUser() {
     $serialized = $serializer->serialize($normalized, $this->defaultFormat, $context);
     $this->httpRequest($account->urlInfo(), 'PATCH', $serialized, $this->defaultMimeType);
     $this->assertResponse(204);
+    $this->curlCookies = $this->cookies;
 
     // Try to change the password without providing the current password.
     $new_password = $this->randomString();
diff --git a/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
index 8fae81a..429ff85 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -121,20 +121,12 @@
   protected $loggedInUser = FALSE;
 
   /**
-   * Guzzle Test.
-   *
-   * @var \Drupal\Core\Session\AccountInterface|bool
-   */
-  protected $guzzle = FALSE;
-
-  /**
    * The "#1" admin user.
    *
    * @var \Drupal\Core\Session\AccountInterface
    */
   protected $rootUser;
 
-
   /**
    * The current cookie file used by cURL.
    *
@@ -511,11 +503,6 @@ protected function drupalLogout() {
     // idea being if you were properly logged out you should be seeing a login
     // screen.
 
-    if ($this->guzzle) {
-      $this->httpRequest('user/logout', 'GET');
-    } else {
-      $this->drupalGet('user/logout', array('query' => array('destination' => 'user/login')));
-    }
     $this->assertResponse(200, 'User was logged out.');
     $pass = $this->assertField('name', 'Username field found.', 'Logout');
     $pass = $pass && $this->assertField('pass', 'Password field found.', 'Logout');