Remove unused variable

Author: aleron75

app/code/Magento/Persistent/Test/Unit/Block/Header/AdditionalTest.php

@@ -264,7 +264,6 @@ public function testToHtml($customerId)
         $this->eventManagerMock->expects($this->at(0))
             ->method('dispatch')
             ->with('view_block_abstract_to_html_before', ['block' => $this->additional]);
-        $transport = new \Magento\Framework\DataObject(['html' => '']);
         $this->eventManagerMock->expects($this->at(1))
             ->method('dispatch')
             ->with('view_block_abstract_to_html_after');