Removing the mutation in the factories for getting dep repositories

appengine/findit/common/test/chrome_dependency_fetcher_test.py

Index: appengine/findit/common/test/chrome_dependency_fetcher_test.py
diff --git a/appengine/findit/common/test/chrome_dependency_fetcher_test.py b/appengine/findit/common/test/chrome_dependency_fetcher_test.py
index fc47bef1f84db6940d390e62f7587a16cb635885..b74cd9a125ca55d011aa468117458639687e4dcc 100644
--- a/appengine/findit/common/test/chrome_dependency_fetcher_test.py
+++ b/appengine/findit/common/test/chrome_dependency_fetcher_test.py
@@ -35,13 +35,18 @@ class MockGitilesRepository(GitRepository):
     return self.RESPONSES.get(path, {}).get(revision, None)
 
 
+def MockGitilesRepositoryFactory(repo_url):
+  """A factory for creating ``MockGitilesRepository`` objects."""
+  return MockGitilesRepository(repo_url)
+
+
 class ChromiumDEPSTest(testing.AppengineTestCase):
   DEPS_GIT = '.DEPS.git'
   DEPS = 'DEPS'
   deps_downloader = chrome_dependency_fetcher.DEPSDownloader(
-      MockGitilesRepository())
+      MockGitilesRepositoryFactory)
   chrome_dep_fetcher = chrome_dependency_fetcher.ChromeDependencyFetcher(
-      MockGitilesRepository())
+      MockGitilesRepositoryFactory)
 
   def testUseDEPS_GIT(self):
     revision = 'abc'
@@ -129,8 +134,8 @@ class ChromiumDEPSTest(testing.AppengineTestCase):
     self.mock(http_client_appengine.HttpClientAppengine, '_Get', _MockGet)
 
     deps_downloader = chrome_dependency_fetcher.DEPSDownloader(
-        gitiles_repository.GitilesRepository(
-            http_client=http_client_appengine.HttpClientAppengine()))
+        lambda repo_url: gitiles_repository.GitilesRepository(
+            http_client_appengine.HttpClientAppengine(), repo_url))
     content = deps_downloader.Load(
         'http://chrome-internal', '50.0.1234.0', 'DEPS')
     self.assertEqual(content, 'Dummy DEPS content')