MTA-3882: Create auto test to Close a Sales Order Paid with PayPal Payments Pro Hosted Solution

dev/tests/functional/tests/app/Magento/Paypal/Test/Block/Onepage/Payment/HostedPro.php

@@ -16,5 +16,5 @@ class HostedPro extends PaypalIframe
      *
      * @var string
      */
-    protected $formBlockCc = '\Magento\Paypal\Test\Block\Form\HostedPro\Cc';
+    protected $formBlockCc = \Magento\Paypal\Test\Block\Form\HostedPro\Cc::class;
 }

dev/tests/functional/tests/app/Magento/Paypal/Test/Block/Onepage/Payment/PayflowLink.php

@@ -16,5 +16,5 @@ class PayflowLink extends PaypalIframe
      *
      * @var string
      */
-    protected $formBlockCc = '\Magento\Paypal\Test\Block\Form\PayflowLink\Cc';
+    protected $formBlockCc = \Magento\Paypal\Test\Block\Form\PayflowLink\Cc::class;
 }

dev/tests/functional/tests/app/Magento/Paypal/Test/Block/Onepage/Payment/PaymentsAdvanced.php

@@ -16,5 +16,5 @@ class PaymentsAdvanced extends PaypalIframe
      *
      * @var string
      */
-    protected $formBlockCc = '\Magento\Paypal\Test\Block\Form\PaymentsAdvanced\Cc';
+    protected $formBlockCc = \Magento\Paypal\Test\Block\Form\PaymentsAdvanced\Cc::class;
 }