Plugin: Remove PHP functions slated for removal in 5.2 (#14090)

* Plugin: Remove PHP functions slated for removal in 5.2

* Documentation: Update FAQ to avoid reference to deprecated function

docs/designers-developers/faq.md

@@ -365,8 +365,7 @@ var blocks = wp.blocks.parse( postContent );
 In PHP:
 
 ```php
-$blocks = gutenberg_parse_blocks( $post_content ); // plugin
-$blocks = parse_blocks( $post_content ); // WordPress 5.0
+$blocks = parse_blocks( $post_content );
 ```
 
 ## Why should I start using this once released?

gutenberg.php

@@ -234,103 +234,3 @@ function gutenberg_init( $return, $post ) {
 
 	return true;
 }
-
-/**
- * Adds the filters to register additional links for the Gutenberg editor in
- * the post/page screens.
- *
- * @since 1.5.0
- * @deprecated 5.0.0
- */
-function gutenberg_add_edit_link_filters() {
-	_deprecated_function( __FUNCTION__, '5.0.0' );
-}
-
-/**
- * Registers an additional link in the post/page screens to edit any post/page in
- * the Classic editor.
- *
- * @since 1.5.0
- * @deprecated 5.0.0
- *
- * @param array $actions Post actions.
- *
- * @return array Updated post actions.
- */
-function gutenberg_add_edit_link( $actions ) {
-	_deprecated_function( __FUNCTION__, '5.0.0' );
-
-	return $actions;
-}
-
-/**
- * Removes the Edit action from the reusable block list's Bulk Actions dropdown.
- *
- * @since 3.8.0
- * @deprecated 5.0.0
- *
- * @param array $actions Bulk actions.
- *
- * @return array Updated bulk actions.
- */
-function gutenberg_block_bulk_actions( $actions ) {
-	_deprecated_function( __FUNCTION__, '5.0.0' );
-
-	return $actions;
-}
-
-/**
- * Prints the JavaScript to replace the default "Add New" button.$_COOKIE
- *
- * @since 1.5.0
- * @deprecated 5.0.0
- */
-function gutenberg_replace_default_add_new_button() {
-	_deprecated_function( __FUNCTION__, '5.0.0' );
-}
-
-/**
- * Adds the block-editor-page class to the body tag on the Gutenberg page.
- *
- * @since 1.5.0
- * @deprecated 5.0.0
- *
- * @param string $classes Space separated string of classes being added to the body tag.
- * @return string The $classes string, with block-editor-page appended.
- */
-function gutenberg_add_admin_body_class( $classes ) {
-	_deprecated_function( __FUNCTION__, '5.0.0' );
-
-	return $classes;
-}
-
-/**
- * Adds attributes to kses allowed tags that aren't in the default list
- * and that Gutenberg needs to save blocks such as the Gallery block.
- *
- * @deprecated 5.0.0
- *
- * @param array $tags Allowed HTML.
- * @return array (Maybe) modified allowed HTML.
- */
-function gutenberg_kses_allowedtags( $tags ) {
-	_deprecated_function( __FUNCTION__, '5.0.0' );
-
-	return $tags;
-}
-
-/**
- * Adds the wp-embed-responsive class to the body tag if the theme has opted in to
- * Gutenberg responsive embeds.
- *
- * @since 4.1.0
- * @deprecated 5.0.0
- *
- * @param Array $classes Array of classes being added to the body tag.
- * @return Array The $classes array, with wp-embed-responsive appended.
- */
-function gutenberg_add_responsive_body_class( $classes ) {
-	_deprecated_function( __FUNCTION__, '5.0.0' );
-
-	return $classes;
-}