tweak stdlib imports to follow Google style guide

Google Python style guide says to import modules.
Clean up all our stdlib imports.  Leave the repo ones alone
for now as that's a much bigger shave.

Change-Id: Ida42fc2ae78b86e6b7a6cbc98f94ca04b295f8cc
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/383714
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>
Tested-by: Mike Frysinger <vapier@google.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/repo_trace.py b/repo_trace.py
index 49462174..01beaf8e 100644
--- a/repo_trace.py
+++ b/repo_trace.py
@@ -20,11 +20,11 @@ Temporary: Tracing is always on. Set `REPO_TRACE=0` to turn off.
 To also include trace outputs in stderr do `repo --trace_to_stderr ...`
 """
 
+import contextlib
 import sys
 import os
 import time
 import tempfile
-from contextlib import ContextDecorator
 
 import platform_utils
 
@@ -68,7 +68,7 @@ def _SetTraceFile(quiet):
     _TRACE_FILE = _GetTraceFile(quiet)
 
 
-class Trace(ContextDecorator):
+class Trace(contextlib.ContextDecorator):
     """Used to capture and save git traces."""
 
     def _time(self):