Fix git-freeze when using a commit hook which could reject a commit.

git_common.py

 # Copyright 2014 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.
 
 # Monkeypatch IMapIterator so that Ctrl-C can kill everything properly.
 # Derived from https://gist.github.com/aljungberg/626518
 import multiprocessing.pool
 from multiprocessing.pool import IMapIterator
 def wrapper(func):
   def wrap(self, timeout=None):
@@ skipping 339 matching lines @@
   try:
     run('config', '--' + scope, '--unset', option)
   except subprocess2.CalledProcessError:
     pass
 
 
 def freeze():
   took_action = False
 
   try:
-    run('commit', '-m', FREEZE + '.indexed')
+    run('commit', '--no-verify', '-m', FREEZE + '.indexed')
     took_action = True
   except subprocess2.CalledProcessError:
     pass
 
   try:
     run('add', '-A')
-    run('commit', '-m', FREEZE + '.unindexed')
+    run('commit', '--no-verify', '-m', FREEZE + '.unindexed')
     took_action = True
   except subprocess2.CalledProcessError:
     pass
 
   if not took_action:
     return 'Nothing to freeze.'
 
 
 def get_branch_tree():
   """Get the dictionary of {branch: parent}, compatible with topo_iter.
@@ skipping 432 matching lines @@
         hash=branch_hash, upstream=upstream_branch, ahead=ahead, behind=behind)
 
   # Set None for upstreams which are not branches (e.g empty upstream, remotes
   # and deleted upstream branches).
   missing_upstreams = {}
   for info in info_map.values():
     if info.upstream not in info_map and info.upstream not in missing_upstreams:
       missing_upstreams[info.upstream] = None
 
   return dict(info_map.items() + missing_upstreams.items())