[Findit] Factoring the gitiles (etc) stuff out into its own directory

appengine/findit/crash/changelist_classifier.py

Index: appengine/findit/crash/changelist_classifier.py
diff --git a/appengine/findit/crash/changelist_classifier.py b/appengine/findit/crash/changelist_classifier.py
index c96acc1ecae94d7ee1c855002ea3e026616b3c49..748de804e59253ddca98f7f3d934d7e789192f4d 100644
--- a/appengine/findit/crash/changelist_classifier.py
+++ b/appengine/findit/crash/changelist_classifier.py
@@ -6,8 +6,6 @@ import logging
 from collections import defaultdict
 
 from common import chrome_dependency_fetcher
-from common.diff import ChangeType
-from common.git_repository import GitRepository
 from common.http_client_appengine import HttpClientAppengine
 from crash import crash_util
 from crash.results import MatchResults
@@ -16,6 +14,7 @@ from crash.scorers.min_distance import MinDistance
 from crash.scorers.top_frame_index import TopFrameIndex
 from crash.stacktrace import CallStack
 from crash.stacktrace import Stacktrace
+from lib.gitiles.diff import ChangeType
 
 # TODO(wrengr): make this a namedtuple.
 class ChangelistClassifier(object):