If we're running in nohooks mode, don't bother to accumulate file_list in gclient.

scm.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """SCM-specific utility classes."""
 
 import cStringIO
 import glob
 import logging
 import os
@@ skipping 494 matching lines @@
 
     Args:
       verbose: If True, uses verbose output
       args: A sequence of command line parameters to be passed to svn.
       cwd: The directory where svn is to be run.
 
     Raises:
       Error: An error occurred while running the svn command.
     """
     stdout = stdout or sys.stdout
+    if file_list is None:
+      # Even if our caller doesn't care about file_list, we use it internally.
+      file_list = []
 
     # svn update and svn checkout use the same pattern: the first three columns
     # are for file status, property status, and lock status.  This is followed
     # by two spaces, and then the path to the file.
     update_pattern = '^...  (.*)$'
 
     # The first three columns of svn status are the same as for svn update and
     # svn checkout.  The next three columns indicate addition-with-history,
     # switch, and remote lock status.  This is followed by one space, and then
     # the path to the file.
@@ skipping 575 matching lines @@
         # revert, like for properties.
         if not os.path.isdir(cwd):
           # '.' was deleted. It's not worth continuing.
           return
         try:
           SVN.Capture(['revert', file_status[1]], cwd=cwd)
         except subprocess2.CalledProcessError:
           if not os.path.exists(file_path):
             continue
           raise