Issue #3127255 by kiamlaluno, longwave, johndevman: system_requirements()...

Issue #3127255 by kiamlaluno, longwave, johndevman: system_requirements() checks for values that Unicode::check() doesn't return anymore

core/modules/system/system.install

@@ -1060,14 +1060,6 @@ function system_requirements($phase) {
     case 'mbstring.encoding_translation':
       $requirements['unicode']['description'] = t('Multibyte string input conversion in PHP is active and must be disabled. Check the php.ini <em>mbstring.encoding_translation</em> setting. Please refer to the <a href="http://php.net/mbstring">PHP mbstring documentation</a> for more information.');
       break;
-
-    case 'mbstring.http_input':
-      $requirements['unicode']['description'] = t('Multibyte string input conversion in PHP is active and must be disabled. Check the php.ini <em>mbstring.http_input</em> setting. Please refer to the <a href="http://php.net/mbstring">PHP mbstring documentation</a> for more information.');
-      break;
-
-    case 'mbstring.http_output':
-      $requirements['unicode']['description'] = t('Multibyte string output conversion in PHP is active and must be disabled. Check the php.ini <em>mbstring.http_output</em> setting. Please refer to the <a href="http://php.net/mbstring">PHP mbstring documentation</a> for more information.');
-      break;
   }
 
   if ($phase == 'runtime') {