Docserver: Pull knowledge of host file systems into a single

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

Index: chrome/common/extensions/docs/server2/app_yaml_helper_test.py
diff --git a/chrome/common/extensions/docs/server2/app_yaml_helper_test.py b/chrome/common/extensions/docs/server2/app_yaml_helper_test.py
index 59e2014bda01d027680ebcc00f44a380d9c954e6..6dc24da3b018cc94b6f5bc4be60d025b450d99d2 100755
--- a/chrome/common/extensions/docs/server2/app_yaml_helper_test.py
+++ b/chrome/common/extensions/docs/server2/app_yaml_helper_test.py
@@ -7,7 +7,7 @@ import unittest
 
 from app_yaml_helper import AppYamlHelper
 from file_system import FileNotFoundError
-from host_file_system_creator import HostFileSystemCreator
+from host_file_system_provider import HostFileSystemProvider
 from mock_file_system import MockFileSystem
 from object_store_creator import ObjectStoreCreator
 from test_file_system import TestFileSystem
@@ -89,13 +89,13 @@ class AppYamlHelperTest(unittest.TestCase):
     def constructor(branch, revision=None):
       return MockFileSystem.Create(TestFileSystem(test_data),
                                    updates[:revision])
-    host_file_system_creator = HostFileSystemCreator(
+    host_file_system_provider = HostFileSystemProvider(
         ObjectStoreCreator.ForTest(),
+        trunk=file_system_at_head,
         constructor_for_test=constructor)
     helper = AppYamlHelper('server2/app.yaml',
-                           file_system_at_head,
                            ObjectStoreCreator.ForTest(disable_wrappers=False),
-                           host_file_system_creator)
+                           host_file_system_provider)
 
     def assert_is_up_to_date(version):
       self.assertTrue(helper.IsUpToDate(version),