Removing the mutation in the factories for getting dep repositories

appengine/findit/waterfall/extract_deps_info_pipeline.py

Index: appengine/findit/waterfall/extract_deps_info_pipeline.py
diff --git a/appengine/findit/waterfall/extract_deps_info_pipeline.py b/appengine/findit/waterfall/extract_deps_info_pipeline.py
index 7f8a7133a835299d65f7afccdd2213d5c2c20b32..b9258c1ed1f6e7225c44fc6f3b9f3ce1a32eb0f7 100644
--- a/appengine/findit/waterfall/extract_deps_info_pipeline.py
+++ b/appengine/findit/waterfall/extract_deps_info_pipeline.py
@@ -46,8 +46,8 @@ def _GetOSPlatformName(master_name, builder_name):  # pragma: no cover
 def _GetDependencies(chromium_revision, os_platform):
   """Returns the dependencies used by the specified chromium revision."""
   deps = {}
-  dep_fetcher=chrome_dependency_fetcher.ChromeDependencyFetcher(
-      CachedGitilesRepository(HttpClientAppengine()))
+  dep_fetcher = chrome_dependency_fetcher.ChromeDependencyFetcher(
+      CachedGitilesRepository.Factory(HttpClientAppengine()))
   for path, dependency in dep_fetcher.GetDependency(
       chromium_revision, os_platform).iteritems():
     deps[path] = {
@@ -80,8 +80,8 @@ def _DetectDependencyRolls(change_logs, os_platform):
     }
   """
   deps_rolls = {}
-  dep_fetcher=chrome_dependency_fetcher.ChromeDependencyFetcher(
-      CachedGitilesRepository(HttpClientAppengine()))
+  dep_fetcher = chrome_dependency_fetcher.ChromeDependencyFetcher(
+      CachedGitilesRepository.Factory(HttpClientAppengine()))
   for revision, change_log in change_logs.iteritems():
     # Check DEPS roll only if the chromium DEPS file is changed by the CL.
     for touched_file in change_log['touched_files']: