Remove force push from GitCheckout.commit()

checkout.py

 # coding=utf8
 # 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.
 """Manages a project checkout.
 
 Includes support for svn, git-svn and git.
 """
 
 import ConfigParser
@@ skipping 731 matching lines @@
       # from the email and call it the original author's name.
       # TODO(rmistry): Do not need the below if user is already in
       #                "Name <email>" format.
       name = user.split('@')[0]
       commit_cmd.extend(['--author', '%s <%s>' % (name, user)])
     self._check_call_git(commit_cmd)
 
     # Push to the remote repository.
     self._check_call_git(
         ['push', 'origin', '%s:%s' % (self.working_branch, self.remote_branch),
-         '--force', '--quiet'])
+         '--quiet'])
     # Get the revision after the push.
     revision = self._get_head_commit_hash()
     # Switch back to the remote_branch and sync it.
     self._check_call_git(['checkout', self.remote_branch])
     self._sync_remote_branch()
     # Delete the working branch since we are done with it.
     self._check_call_git(['branch', '-D', self.working_branch])
 
     return revision
 
@@ skipping 74 matching lines @@
   def revisions(self, rev1, rev2):
     return self.checkout.revisions(rev1, rev2)
 
   @property
   def project_name(self):
     return self.checkout.project_name
 
   @property
   def project_path(self):
     return self.checkout.project_path