[Culprit-Finder] Refactor GitilesRepostory to make http_client required argument.

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 303a2762e2326f6ef63b359afdc47a22b22689e8..f76955cec40295b9ade8adff933afc2fc8f2f25d 100644
--- a/appengine/findit/waterfall/extract_deps_info_pipeline.py
+++ b/appengine/findit/waterfall/extract_deps_info_pipeline.py
@@ -47,7 +47,7 @@ def _GetDependencies(chromium_revision, os_platform):
   """Returns the dependencies used by the specified chromium revision."""
   deps = {}
   dep_fetcher=chrome_dependency_fetcher.ChromeDependencyFetcher(
-      gitiles_repository.GitilesRepository(http_client=HttpClientAppengine()))
+      gitiles_repository.GitilesRepository(HttpClientAppengine()))
   for path, dependency in dep_fetcher.GetDependency(
       chromium_revision, os_platform).iteritems():
     deps[path] = {
@@ -81,7 +81,7 @@ def _DetectDependencyRolls(change_logs, os_platform):
   """
   deps_rolls = {}
   dep_fetcher=chrome_dependency_fetcher.ChromeDependencyFetcher(
-      gitiles_repository.GitilesRepository(http_client=HttpClientAppengine()))
+      gitiles_repository.GitilesRepository(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']: