MC-19612: Revert MC-15378

Author: vzabaznov

app/code/Magento/Customer/Model/Visitor.php

@@ -169,6 +169,11 @@ public function initByRequest($observer)
 
         $this->setLastVisitAt((new \DateTime())->format(\Magento\Framework\Stdlib\DateTime::DATETIME_PHP_FORMAT));
 
+        // prevent saving Visitor for safe methods, e.g. GET request
+        if ($this->requestSafety->isSafeMethod()) {
+            return $this;
+        }
+        
         if (!$this->getId()) {
             $this->setSessionId($this->session->getSessionId());
             $this->save();

dev/tests/integration/testsuite/Magento/Customer/Controller/AccountTest.php

@@ -798,21 +798,6 @@ public function loginPostRedirectDataProvider()
         ];
     }
 
-    /**
-     * @magentoDataFixture Magento/Customer/_files/customer.php
-     * @magentoDataFixture Magento/Customer/_files/customer_address.php
-     * @magentoAppArea frontend
-     */
-    public function testCheckVisitorModel()
-    {
-        /** @var \Magento\Customer\Model\Visitor $visitor */
-        $visitor = $this->_objectManager->get(\Magento\Customer\Model\Visitor::class);
-        $this->login(1);
-        $this->assertNull($visitor->getId());
-        $this->dispatch('customer/account/index');
-        $this->assertNotNull($visitor->getId());
-    }
-
     /**
      * @param string $email
      * @return void