Customize: Deprecate `page_home` nav menu item starter content in favor of `home_link`; replace usage in Twenty Seventeen.

Props celloexpressions, westonruter.
See #38615, #38114, [38991].
Merges [39561] to the 4.7 branch.
Fixes #39104.

Built from https://develop.svn.wordpress.org/branches/4.7@39575


git-svn-id: http://core.svn.wordpress.org/branches/4.7@39515 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentyseventeen/functions.php

@@ -169,7 +169,7 @@ function twentyseventeen_setup() {
 			'top' => array(
 				'name' => __( 'Top Menu', 'twentyseventeen' ),
 				'items' => array(
-					'page_home',
+					'link_home',
 					'page_about',
 					'page_blog',
 					'page_contact',

wp-includes/theme.php

@@ -1965,7 +1965,12 @@ function get_theme_starter_content() {
 			) ),
 		),
 		'nav_menus' => array(
-			'page_home' => array(
+			'link_home' => array(
+				'type' => 'custom',
+				'title' => _x( 'Home', 'Theme starter content' ),
+				'url' => home_url(),
+			),
+			'page_home' => array( // Deprecated in favor of home_link.
 				'type' => 'post_type',
 				'object' => 'page',
 				'object_id' => '{{home}}',