Remove safesync support from gclient[_scm].py

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.
 
 """Gclient-specific SCM-specific operations."""
 
 from __future__ import print_function
 
 import errno
 import logging
@@ skipping 759 matching lines @@
                 stdout=self.out_fh, always=options.verbose)
       if file_list is not None:
         files = self._Capture(['diff', '--name-only'] + merge_base).split()
         file_list.extend([os.path.join(self.checkout_path, f) for f in files])
 
   def GetUsableRev(self, rev, options):
     """Finds a useful revision for this repository."""
     sha1 = None
     if not os.path.isdir(self.checkout_path):
       raise NoUsableRevError(
-          ( 'We could not find a valid hash for safesync_url response "%s".\n'
-            'Safesync URLs with a git checkout currently require the repo to\n'
-            'be cloned without a safesync_url before adding the safesync_url.\n'
-            'For more info, see: '
-            'http://code.google.com/p/chromium/wiki/UsingNewGit'
-            '#Initial_checkout' ) % rev)
+          'This is not a git repo, so we cannot get a usable rev.')
 
     if scm.GIT.IsValidRevision(cwd=self.checkout_path, rev=rev):
       sha1 = rev
     else:
       # May exist in origin, but we don't have it yet, so fetch and look
       # again.
       self._Fetch(options)
       if scm.GIT.IsValidRevision(cwd=self.checkout_path, rev=rev):
         sha1 = rev
 
     if not sha1:
       raise NoUsableRevError(
-          ('We could not find a valid hash for safesync_url response "%s".\n'
-           'Please ensure that your safesync_url provides git sha1 hashes.\n'
-           'For more info, see:\n'
-           'http://code.google.com/p/chromium/wiki/UsingNewGit#Initial_checkout'
-          ) % rev)
+          'Hash %s does not appear to be a valid hash in this repo.' % rev)
 
     return sha1
 
   def FullUrlForRelativeUrl(self, url):
     # Strip from last '/'
     # Equivalent to unix basename
     base_url = self.url
     return base_url[:base_url.rfind('/')] + url
 
   def GetGitBackupDirPath(self):
@@ skipping 362 matching lines @@
     kwargs.setdefault('cwd', self.checkout_path)
     kwargs.setdefault('stdout', self.out_fh)
     kwargs['filter_fn'] = self.filter
     kwargs.setdefault('print_stdout', False)
     env = scm.GIT.ApplyEnvVars(kwargs)
     cmd = ['git'] + args
     if show_header:
       gclient_utils.CheckCallAndFilterAndHeader(cmd, env=env, **kwargs)
     else:
       gclient_utils.CheckCallAndFilter(cmd, env=env, **kwargs)