Use RemarkupControl in Differential inline comment UI

Summary: Fixes T4317. Update the "inline comment" control to a RemarkupControl. This could maybe use some padding/spacing/design touches eventually but seems OK for the moment.

Test Plan: {F101825}

Reviewers: chad, btrahan

Reviewed By: chad

CC: chad, aran

Maniphest Tasks: T4317

Differential Revision: https://secure.phabricator.com/D7969

src/infrastructure/diff/PhabricatorInlineCommentController.php

@@ -235,14 +235,11 @@ abstract class PhabricatorInlineCommentController
   }
 
   private function renderTextArea($text) {
-    return javelin_tag(
-      'textarea',
-      array(
-        'class' => 'differential-inline-comment-edit-textarea',
-        'sigil' => 'differential-inline-comment-edit-textarea',
-        'name' => 'text',
-      ),
-      $text);
+    return id(new PhabricatorRemarkupControl())
+      ->setUser($this->getRequest()->getUser())
+      ->setSigil('differential-inline-comment-edit-textarea')
+      ->setName('text')
+      ->setValue($text);
   }
 
 }