diff --git a/core/lib/Drupal/Component/Utility/String.php b/core/lib/Drupal/Component/Utility/String.php
deleted file mode 100644
index df4ba54440fe36939666b94d96eafda037f0fe21..0000000000000000000000000000000000000000
--- a/core/lib/Drupal/Component/Utility/String.php
+++ /dev/null
@@ -1,104 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\Component\Utility\SafeMarkup.
- */
-
-namespace Drupal\Component\Utility;
-
-/**
- * Provides helpers to operate on strings.
- *
- * @ingroup utility
- */
-class String {
-
-  /**
-   * Encodes special characters in a plain-text string for display as HTML.
-   *
-   * @param string $text
-   *   The text to be checked or processed.
-   *
-   * @return string
-   *   An HTML safe version of $text, or an empty string if $text is not
-   *   valid UTF-8.
-   *
-   * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
-   *   Use \Drupal\Component\Utility\SafeMarkup::checkPlain() instead.
-   */
-  public static function checkPlain($text) {
-    return SafeMarkup::checkPlain($text);
-  }
-
-  /**
-   * Decodes all HTML entities including numerical ones to regular UTF-8 bytes.
-   *
-   * @param string $text
-   *   The text to decode entities in.
-   *
-   * @return string
-   *   The input $text, with all HTML entities decoded once.
-   *
-   * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
-   *   Use \Drupal\Component\Utility\Html::decodeEntities() instead.
-   */
-  public static function decodeEntities($text) {
-    return Html::decodeEntities($text);
-  }
-
-  /**
-   * Formats a string for HTML display by replacing variable placeholders.
-   *
-   * @param $string
-   *   A string containing placeholders. The string itself is not escaped, any
-   *   unsafe content must be in $args and inserted via placeholders.
-   * @param $args
-   *   An associative array of replacements to make. Occurrences in $string of
-   *   any key in $args are replaced with the corresponding value, after
-   *   optional sanitization and formatting. The type of sanitization and
-   *   formatting depends on the first character of the key:
-   *   - @variable: Escaped to HTML using
-   *     \Drupal\Component\Utility\SafeMarkup::escape(). Use this as the
-   *     default choice for anything displayed on a page on the site.
-   *   - %variable: Escaped to HTML and formatted using SafeMarkup::placeholder(),
-   *     which makes the following HTML code:
-   *     @code
-   *       <em class="placeholder">text output here.</em>
-   *     @endcode
-   *   - !variable: Inserted as is, with no sanitization or formatting. Only
-   *     use this when the resulting string is being generated for one of:
-   *     - Non-HTML usage, such as a plain-text email.
-   *     - Non-direct HTML output, such as a plain-text variable that will be
-   *       printed as an HTML attribute value and therefore formatted with
-   *       SafeMarkup::checkPlain() as part of that.
-   *     - Some other special reason for suppressing sanitization.
-   *
-   * @return string
-   *   The formatted string, which is marked as safe unless sanitization of an
-   *   unsafe argument was suppressed (see above).
-   *
-   * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
-   *   Use \Drupal\Component\Utility\SafeMarkup::format() instead.
-   */
-  public static function format($string, array $args = array()) {
-    return SafeMarkup::format($string, $args);
-  }
-
-  /**
-   * Formats text for emphasized display in a placeholder inside a sentence.
-   *
-   * @param string $text
-   *   The text to format (plain-text).
-   *
-   * @return string
-   *   The formatted text (html).
-   *
-   * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
-   *   Use \Drupal\Component\Utility\SafeMarkup::placeholder() instead.
-   */
-  public static function placeholder($text) {
-    return SafeMarkup::placeholder($text);
-  }
-
-}