Delete dead code handling README

Summary: Since D2336.

Test Plan: Looked at README in Diffusion.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4015

src/applications/diffusion/controller/DiffusionBrowseController.php

@@ -45,8 +45,6 @@ final class DiffusionBrowseController extends DiffusionController {
 
     } else {
 
-      $readme = null;
-
       $phids = array();
       foreach ($results as $result) {
         $data = $result->getLastCommitData();
@@ -55,11 +53,6 @@ final class DiffusionBrowseController extends DiffusionController {
             $phids[$data->getCommitDetail('authorPHID')] = true;
           }
         }
-
-        $path = $result->getPath();
-        if (preg_match('/^readme(|\.txt|\.remarkup)$/i', $path)) {
-          $readme = $result;
-        }
       }
 
       $phids = array_keys($phids);