Remove duplicate inline scaffold in 2up renderer

Summary: Ref T2009. Remove the 4 (!!) copies of this code.

Test Plan:
  - Added, edited, and removed inline comments in 2up view.
  - Stacked a bunch of comments on the same line and saw the JS place them correctly.
  - Created an image diff and added, edited and removed inlines on it.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T2009

Differential Revision: https://secure.phabricator.com/D12000

src/infrastructure/diff/view/PHUIDiffTwoUpInlineCommentRowScaffold.php

@@ -66,7 +66,7 @@ final class PHUIDiffTwoUpInlineCommentRowScaffold
       phutil_tag('td', $right_attrs, $right_side),
     );
 
-    return phutil_tag('tr', array(), $cells);
+    return phutil_tag('tr', $this->getRowAttributes(), $cells);
   }
 
 }