[Backport] Removed direct use of SessionManager class, used SessionManagerInterface instead

app/code/Magento/Customer/CustomerData/Plugin/SessionChecker.php

@@ -5,10 +5,13 @@
  */
 namespace Magento\Customer\CustomerData\Plugin;
 
-use Magento\Framework\Session\SessionManager;
+use Magento\Framework\Session\SessionManagerInterface;
 use Magento\Framework\Stdlib\Cookie\CookieMetadataFactory;
 use Magento\Framework\Stdlib\Cookie\PhpCookieManager;
 
+/**
+ * Class SessionChecker
+ */
 class SessionChecker
 {
     /**
@@ -36,10 +39,12 @@ public function __construct(
     /**
      * Delete frontend session cookie if customer session is expired
      *
-     * @param SessionManager $sessionManager
+     * @param SessionManagerInterface $sessionManager
      * @return void
+     * @throws \Magento\Framework\Exception\InputException
+     * @throws \Magento\Framework\Stdlib\Cookie\FailureToSendException
      */
-    public function beforeStart(SessionManager $sessionManager)
+    public function beforeStart(SessionManagerInterface $sessionManager)
     {
         if (!$this->cookieManager->getCookie($sessionManager->getName())
             && $this->cookieManager->getCookie('mage-cache-sessid')

app/code/Magento/Customer/etc/frontend/di.xml

@@ -57,7 +57,7 @@
     <type name="Magento\Checkout\Block\Cart\Sidebar">
         <plugin name="customer_cart" type="Magento\Customer\Model\Cart\ConfigPlugin" />
     </type>
-    <type name="Magento\Framework\Session\SessionManager">
+    <type name="Magento\Framework\Session\SessionManagerInterface">
         <plugin name="session_checker" type="Magento\Customer\CustomerData\Plugin\SessionChecker" />
     </type>
     <type name="Magento\Authorization\Model\CompositeUserContext">
@@ -77,4 +77,4 @@
             </argument>
         </arguments>
     </type>
-</config>
+</config>

app/code/Magento/Paypal/Controller/Transparent/RequestSecureToken.php

@@ -11,6 +11,7 @@
 use Magento\Framework\Controller\ResultInterface;
 use Magento\Framework\Session\Generic;
 use Magento\Framework\Session\SessionManager;
+use Magento\Framework\Session\SessionManagerInterface;
 use Magento\Paypal\Model\Payflow\Service\Request\SecureToken;
 use Magento\Paypal\Model\Payflow\Transparent;
 use Magento\Quote\Model\Quote;
@@ -39,7 +40,7 @@ class RequestSecureToken extends \Magento\Framework\App\Action\Action
     private $secureTokenService;
 
     /**
-     * @var SessionManager
+     * @var SessionManager|SessionManagerInterface
      */
     private $sessionManager;
 
@@ -55,19 +56,21 @@ class RequestSecureToken extends \Magento\Framework\App\Action\Action
      * @param SecureToken $secureTokenService
      * @param SessionManager $sessionManager
      * @param Transparent $transparent
+     * @param SessionManagerInterface|null $sessionInterface
      */
     public function __construct(
         Context $context,
         JsonFactory $resultJsonFactory,
         Generic $sessionTransparent,
         SecureToken $secureTokenService,
         SessionManager $sessionManager,
-        Transparent $transparent
+        Transparent $transparent,
+        SessionManagerInterface $sessionInterface = null
     ) {
         $this->resultJsonFactory = $resultJsonFactory;
         $this->sessionTransparent = $sessionTransparent;
         $this->secureTokenService = $secureTokenService;
-        $this->sessionManager = $sessionManager;
+        $this->sessionManager = $sessionInterface ?: $sessionManager;
         $this->transparent = $transparent;
         parent::__construct($context);
     }

lib/internal/Magento/Framework/View/Context.php

@@ -14,6 +14,7 @@
 use Magento\Framework\Event\ManagerInterface;
 use Psr\Log\LoggerInterface as Logger;
 use Magento\Framework\Session\SessionManager;
+use Magento\Framework\Session\SessionManagerInterface;
 use Magento\Framework\TranslateInterface;
 use Magento\Framework\UrlInterface;
 use Magento\Framework\View\ConfigInterface as ViewConfig;
@@ -144,6 +145,7 @@ class Context
      * @param Logger $logger
      * @param AppState $appState
      * @param LayoutInterface $layout
+     * @param SessionManagerInterface|null $sessionManager
      *
      * @todo reduce parameter number
      *
@@ -163,15 +165,16 @@ public function __construct(
         CacheState $cacheState,
         Logger $logger,
         AppState $appState,
-        LayoutInterface $layout
+        LayoutInterface $layout,
+        SessionManagerInterface $sessionManager = null
     ) {
         $this->request = $request;
         $this->eventManager = $eventManager;
         $this->urlBuilder = $urlBuilder;
         $this->translator = $translator;
         $this->cache = $cache;
         $this->design = $design;
-        $this->session = $session;
+        $this->session = $sessionManager ?: $session;
         $this->scopeConfig = $scopeConfig;
         $this->frontController = $frontController;
         $this->viewConfig      = $viewConfig;
@@ -332,6 +335,8 @@ public function getModuleName()
     }
 
     /**
+     * Get Front Name
+     *
      * @see getModuleName
      */
     public function getFrontName()