Revert "Issue #3269141 by longwave, sharayurajput, andypost: Alias deprecated...

Revert "Issue #3269141 by longwave, sharayurajput, andypost: Alias deprecated Drupal\Core\StringTranslation\TranslationWrapper to TranslatableMarkup"

This reverts commit c728e353.

core/includes/bootstrap.inc

@@ -60,11 +60,6 @@
  */
 define('DRUPAL_ROOT', dirname(__DIR__, 2));
 
-/**
- * Keep backward compatibility for sites with references to TranslationWrapper.
- */
-class_alias(TranslatableMarkup::class, '\Drupal\Core\StringTranslation\TranslationWrapper', TRUE);
-
 /**
  * Translates a string to the current language or to a given language.
  *

core/lib/Drupal/Core/StringTranslation/TranslationWrapper.php

+<?php
+
+namespace Drupal\Core\StringTranslation;
+
+/**
+ * Provides translatable string class.
+ *
+ * @deprecated in drupal:8.0.0 and is removed from drupal:10.0.0.
+ *   Use the \Drupal\Core\StringTranslation\TranslatableMarkup class instead.
+ *
+ * @see https://www.drupal.org/node/2571255
+ */
+class TranslationWrapper extends TranslatableMarkup {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct($string, array $arguments = [], array $options = [], TranslationInterface $string_translation = NULL) {
+    @trigger_error(__CLASS__ . ' is deprecated in drupal:8.0.0 and is removed from drupal:10.0.0. Use the \Drupal\Core\StringTranslation\TranslatableMarkup class instead. See https://www.drupal.org/node/2571255', E_USER_DEPRECATED);
+    parent::__construct($string, $arguments, $options, $string_translation);
+  }
+
+}

core/tests/Drupal/Tests/Core/StringTranslation/TranslationWrapperTest.php

@@ -7,7 +7,7 @@
 use Drupal\Tests\UnitTestCase;
 
 /**
- * Tests the TranslationWrapper backward compatibility layer.
+ * Tests the TranslationWrapper class.
  *
  * @coversDefaultClass \Drupal\Core\StringTranslation\TranslationWrapper
  * @group StringTranslation
@@ -16,9 +16,11 @@ class TranslationWrapperTest extends UnitTestCase {
 
   /**
    * @covers ::__construct
+   * @group legacy
    */
   public function testTranslationWrapper() {
-    $object = new TranslationWrapper('Backward compatibility');
+    $this->expectDeprecation('Drupal\Core\StringTranslation\TranslationWrapper is deprecated in drupal:8.0.0 and is removed from drupal:10.0.0. Use the \Drupal\Core\StringTranslation\TranslatableMarkup class instead. See https://www.drupal.org/node/2571255');
+    $object = new TranslationWrapper('Deprecated');
     $this->assertInstanceOf(TranslatableMarkup::class, $object);
   }