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 6389265f1044db9ea8dca815b244c3d97732a91c..5c343eac6cd403aaf55ba1bcdfe1544d03522c8f 100644
--- a/appengine/findit/waterfall/extract_deps_info_pipeline.py
+++ b/appengine/findit/waterfall/extract_deps_info_pipeline.py
@@ -7,7 +7,7 @@ import logging
 from common import chrome_dependency_fetcher
 from common.http_client_appengine import HttpClientAppengine
 from common.pipeline_wrapper import BasePipeline
-from gae_libs.gitiles import cached_gitiles_repository
+from gae_libs.gitiles.cached_gitiles_repository import CachedGitilesRepository
 
 
 def _GetOSPlatformName(master_name, builder_name):  # pragma: no cover
@@ -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(
-      cached_gitiles_repository.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(
-      cached_gitiles_repository.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']: