Docserver: Make MockFileSystem not iterate over the entire file system as part

chrome/common/extensions/docs/server2/github_file_system_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import os
 import sys
 import unittest
 
@@ skipping 14 matching lines @@
   def _ReadLocalFile(self, filename):
     with open(os.path.join(self._base_path, filename), 'r') as f:
       return f.read()
 
   def testList(self):
     self.assertEqual(json.loads(self._ReadLocalFile('expected_list.json')),
                      self._file_system.Read(['/']).Get())
 
   def testRead(self):
     self.assertEqual(self._ReadLocalFile('expected_read.txt'),
-                     self._file_system.ReadSingle('/analytics/launch.js').Get())
+                     self._file_system.ReadSingle('analytics/launch.js').Get())
 
   def testStat(self):
     self.assertEqual(0, self._file_system.Stat('zipball').version)
 
   def testKeyGeneration(self):
     self.assertEqual(0, len(files.GetBlobKeys()))
-    self._file_system.ReadSingle('/analytics/launch.js').Get()
+    self._file_system.ReadSingle('analytics/launch.js').Get()
     self.assertEqual(1, len(files.GetBlobKeys()))
-    self._file_system.ReadSingle('/analytics/main.css').Get()
+    self._file_system.ReadSingle('analytics/main.css').Get()
     self.assertEqual(1, len(files.GetBlobKeys()))
 
 if __name__ == '__main__':
   unittest.main()