don't search for files by class name

This code was searching for files in the files UI by a
class name that doesn't exist. Some of the names caused
chrome to freeze when trying this search.

Test Plan:
 * Clicking on a file in the left area of the files area
     should not cause chrome to freeze.

closes #CNVS-3276

Change-Id: I9ade59f4290008091eb5e4531d4dfd5eb752531e
Reviewed-on: https://gerrit.instructure.com/17474
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
QA-Review: Adam Phillipps <adam@instructure.com>

public/javascripts/full_files.js

@@ -429,11 +429,6 @@ define([
         }
       },
       nodeFromPath: function(path) {
-        try {
-          if($files_structure.find("#files_structure_list > li." + path).length > 0) {
-            return $files_structure.find("#files_structure_list > li." + path);
-          }
-        } catch(e) {}
         var names = path.replace(/\/\//g, "\\").split('/');
         var $node = $files_structure;
         var keepGoing = true;