bisect-kit: reformat using yapf 0.27.0

yapf in depot_tools was updated to 0.27.0 recently.

BUG=None
TEST=yapf

Change-Id: I2566fe1f479f8e6c9b0e272215f9502002af2794
diff --git a/bisect_kit/git_util.py b/bisect_kit/git_util.py
index 282e87b..1d565d7 100644
--- a/bisect_kit/git_util.py
+++ b/bisect_kit/git_util.py
@@ -357,8 +357,8 @@
   if len(splitted) >= 4 and splitted[3] == path:
     return stat.S_ISLNK(int(splitted[0], 8))
 
-  raise ValueError(
-      'file %s is not found in repo:%s rev:%s' % (path, git_repo, rev))
+  raise ValueError('file %s is not found in repo:%s rev:%s' %
+                   (path, git_repo, rev))
 
 
 def get_file_from_revision(git_repo, rev, path):