Remove H1-H6 tests and handling (now supported)

Author: sirreal

src/wp-includes/html-api/class-wp-html-processor.php

@@ -893,12 +893,6 @@ private function step_in_body() {
 			case 'FORM':
 			case 'FRAME':
 			case 'FRAMESET':
-			case 'H1':
-			case 'H2':
-			case 'H3':
-			case 'H4':
-			case 'H5':
-			case 'H6':
 			case 'HEAD':
 			case 'HR':
 			case 'HTML':

tests/phpunit/tests/html-api/wpHtmlProcessor.php

@@ -188,12 +188,6 @@ public function data_unsupported_special_in_body_tags() {
 			array( 'FORM' ),
 			array( 'FRAME' ),
 			array( 'FRAMESET' ),
-			array( 'H1' ),
-			array( 'H2' ),
-			array( 'H3' ),
-			array( 'H4' ),
-			array( 'H5' ),
-			array( 'H6' ),
 			array( 'HEAD' ),
 			array( 'HR' ),
 			array( 'HTML' ),