Extract git version check code from gclient_scm.py into scm.py where it belongs.

tests/gclient_scm_test.py

 #!/usr/bin/python
 # Copyright (c) 2010 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.
 
 """Unit tests for gclient_scm.py."""
 
 # Import before super_mox to keep valid references.
 from os import rename
 from shutil import rmtree
@@ skipping 361 matching lines @@
     self.base_path = gclient_scm.os.path.join(self.root_dir, self.relpath)
     self.enabled = self.CreateGitRepo(self.sample_git_import, self.base_path)
     SuperMoxBaseTestBase.setUp(self)
 
   def tearDown(self):
     SuperMoxBaseTestBase.tearDown(self)
     rmtree(self.root_dir)
 
   def testDir(self):
     members = [
-        'COMMAND', 'Capture', 'CaptureStatus', 'FetchUpstreamTuple',
+        'COMMAND', 'AssertVersion', 'Capture', 'CaptureStatus',
+        'FetchUpstreamTuple',
         'FullUrlForRelativeUrl', 'GenerateDiff', 'GetBranch', 'GetBranchRef',
         'GetCheckoutRoot', 'GetDifferentFiles', 'GetEmail', 'GetPatchName',
         'GetSVNBranch', 'GetUpstream', 'IsGitSvn', 'RunAndFilterOutput',
         'ShortBranchName', 'RunCommand',
         'cleanup', 'diff', 'export', 'pack', 'relpath', 'revert',
         'revinfo', 'runhooks', 'scm_name', 'status', 'update', 'url',
     ]
 
     # If you add a member, be sure to add the relevant test!
     self.compareMembers(gclient_scm.CreateSCM(url=self.url), members)
@@ skipping 194 matching lines @@
                                 relpath=self.relpath)
     rev_info = scm.revinfo(options, (), None)
     self.assertEquals(rev_info, '069c602044c5388d2d15c3f875b057c852003458')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()
 
 # vim: ts=2:sw=2:tw=80:et: