diff --git a/src/wp-includes/plugin.php b/src/wp-includes/plugin.php
index 6e3a21e0a3..ca4985f1f0 100644
--- a/src/wp-includes/plugin.php
+++ b/src/wp-includes/plugin.php
@@ -1001,97 +1001,3 @@ function _wp_filter_build_unique_id($tag, $function, $priority) {
 		return $function[0] . '::' . $function[1];
 	}
 }
-
-/**
- * Backs up global variables used for actions and filters.
- *
- * Prevents redefinition of these globals in advanced-cache.php from accidentally
- * destroying existing data.
- *
- * @since 4.6.0
- * @access private
- *
- * @global array $wp_filter         Stores all filters and actions.
- * @global array $wp_actions        Stores the amount of times an action was triggered.
- * @global array $merged_filters    Merges the filter hooks using this function.
- * @global array $wp_current_filter Stores the list of current filters with the current one last.
- * @staticvar array $backup_globals Backed up globals.
- *
- * @return array the staticvar from the first time it is set.
- */
-function _backup_plugin_globals( $backup = true ) {
-	global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;
-
-	static $backup_globals = array();
-
-	if ( $backup ) {
-		$backup_globals = array(
-			'backup_wp_filter'         => $wp_filter,
-			'backup_wp_actions'        => $wp_actions,
-			'backup_merged_filters'    => $merged_filters,
-			'backup_wp_current_filter' => $wp_current_filter,
-		);
-
-		$wp_filter = $wp_actions = array();
-	}
-	return $backup_globals;
-}
-
-/**
- * Safely restores backed up global variables used for actions and filters.
- *
- * @since 4.6.0
- * @access private
- *
- * @global array $wp_filter         Stores all filters and actions.
- * @global array $wp_actions        Stores the amount of times an action was triggered.
- * @global array $merged_filters    Merges the filter hooks using this function.
- * @global array $wp_current_filter Stores the list of current filters with the current one last.
- * @staticvar array $backup_globals Backed up globals.
- */
-function _restore_plugin_globals() {
-	global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;
-
-	$backup_globals = _backup_plugin_globals( false );
-
-	if ( empty( $wp_filter ) ) {
-		$wp_filter = $backup_globals['backup_wp_filter'];
-	} else {
-		$added_filters = $wp_filter;
-		$wp_filter = $backup_globals['backup_wp_filter'];
-
-		foreach ( $added_filters as $tag => $callback_groups ) {
-			// Loop through callback groups.
-			foreach ( $callback_groups as $priority => $callbacks ) {
-
-				// Loop through callbacks.
-				foreach ( $callbacks as $cb ) {
-					add_filter( $tag, $cb['function'], $priority, $cb['accepted_args'] );
-				}
-			}
-		}
-	}
-
-	if ( empty ( $wp_actions ) ) {
-		$wp_actions = $backup_globals['backup_wp_actions'];
-	} else {
-		$run_actions = $wp_actions;
-		$wp_actions = $backup_globals['backup_wp_actions'];
-
-		foreach( $run_actions as $action => $count ) {
-			if ( ! isset( $wp_actions[ $action ] ) ) {
-				$wp_actions[ $action ] = 0;
-			}
-
-			$wp_actions[ $action ] += $count;
-		}
-	}
-
-	if ( $merged_filters !== $backup_globals['backup_merged_filters'] ) {
-		$merged_filters = array_merge_recursive( $merged_filters, $backup_globals['backup_merged_filters'] );
-	}
-
-	if ( $wp_current_filter !== $backup_globals['backup_wp_current_filter'] ) {
-		$wp_current_filter = array_merge_recursive( $wp_current_filter, $backup_globals['backup_wp_current_filter'] );
-	}
-}
diff --git a/src/wp-settings.php b/src/wp-settings.php
index 1a241fac05..dc3b25a7cb 100644
--- a/src/wp-settings.php
+++ b/src/wp-settings.php
@@ -83,9 +83,7 @@ wp_debug_mode();
  */
 if ( WP_CACHE && apply_filters( 'enable_loading_advanced_cache_dropin', true ) ) {
 // For an advanced caching plugin to use. Uses a static drop-in because you would only want one.
-	_backup_plugin_globals( true );
 	WP_DEBUG ? include( WP_CONTENT_DIR . '/advanced-cache.php' ) : @include( WP_CONTENT_DIR . '/advanced-cache.php' );
-	_restore_plugin_globals();
 }
 
 // Define WP_LANG_DIR if not set.
diff --git a/tests/phpunit/tests/actions.php b/tests/phpunit/tests/actions.php
index fd45ffd6af..ebfd6dad5a 100644
--- a/tests/phpunit/tests/actions.php
+++ b/tests/phpunit/tests/actions.php
@@ -328,89 +328,6 @@ class Tests_Actions extends WP_UnitTestCase {
 		$this->assertFalse( doing_filter( 'testing' ) ); // No longer doing this filter
 	}
 
-	/**
-	 * @ticket 36819
-	 */
-	function test_backup_plugin_globals_returns_filters() {
-		$backup = _backup_plugin_globals( true );
-		$this->assertArrayHasKey( 'backup_wp_filter',         $backup );
-		$this->assertArrayHasKey( 'backup_wp_actions',        $backup );
-		$this->assertArrayHasKey( 'backup_wp_current_filter', $backup );
-		$this->assertArrayHasKey( 'backup_merged_filters', $backup );
-	}
-
-	/**
-	 * @ticket 36819
-	 */
-	function test_backup_plugin_globals_returns_filters_from_first_time_called() {
-		$backup = _backup_plugin_globals( true );
-
-		$a = new MockAction();
-		$tag = rand_str();
-
-		add_action($tag, array(&$a, 'action'));
-
-		$new_backup = _backup_plugin_globals( false );
-		$this->assertEquals( $backup, $new_backup );
-	}
-
-	/**
-	 * @ticket 36819
-	 */
-	function test_restore_plugin_globals_from_stomp() {
-		global $wp_actions;
-		$original_actions = $wp_actions;
-
-		_backup_plugin_globals( true );
-
-		$wp_actions = array();
-
-		$this->assertEmpty( $wp_actions );
-		_restore_plugin_globals();
-
-		$this->assertEquals( $GLOBALS['wp_actions'], $original_actions );
-	}
-
-	/**
-	 * @ticket 36819
-	 */
-	function test_restore_plugin_globals_includes_additions() {
-		global $wp_filter;
-		$original_filter = $wp_filter;
-
-		$backup = _backup_plugin_globals( true );
-
-		$a = new MockAction();
-		$tag = rand_str();
-		add_action($tag, array(&$a, 'action'));
-
-		$this->assertNotEquals( $GLOBALS['wp_filter'], $original_filter );
-
-		_restore_plugin_globals();
-
-		$this->assertNotEquals( $GLOBALS['wp_filter'], $original_filter );
-	}
-
-	/**
-	 * @ticket 36819
-	 */
-	function test_applied_actions_are_counted_after_restore() {
-		global $wp_actions;
-
-		$action_name = 'this_is_a_fake_action_name';
-		$this->assertArrayNotHasKey( $action_name, $wp_actions );
-
-		do_action( $action_name );
-
-		$this->assertEquals( 1, $wp_actions[ $action_name ] );
-
-		_backup_plugin_globals( true );
-		do_action( $action_name );
-		_restore_plugin_globals();
-
-		$this->assertEquals( 2, $wp_actions[ $action_name ] );
-	}
-
 	function apply_testing_filter() {
 		$this->apply_testing_filter = true;