Remove usage of gclient_utils.CheckCall() from trychange.py

trychange.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Client-side script to send a try job to the try server. It communicates to
 the try server by either writting to a svn repository or by directly connecting
 to the server by HTTP.
 """
 
@@ skipping 383 matching lines @@
         # Windows' svn.exe has no clue about cygwin paths. Hence force to use
         # the cygwin version in this particular context.
         exe = "/usr/bin/svn"
       else:
         exe = "svn"
       command = [exe, 'import', '-q', temp_dir, options.svn_repo, '--file',
                  temp_file.name]
       if scm.SVN.AssertVersion("1.5")[0]:
         command.append('--no-ignore')
 
-      gclient_utils.CheckCall(command)
-    except gclient_utils.CheckCallError, e:
+      subprocess2.check_output(command, stdout=subprocess2.VOID)
+    except subprocess2.CalledProcessError, e:
       out = e.stdout
       if e.stderr:
         out += e.stderr
       raise NoTryServerAccess(' '.join(e.command) + '\nOuput:\n' + out)
   finally:
     temp_file.close()
     shutil.rmtree(temp_dir, True)
 
 
 def PrintSuccess(options):
@@ skipping 20 matching lines @@
   __pychecker__ = 'no-returnvalues'
   real_path = path.split('@')[0]
   logging.info("GuessVCS(%s)" % path)
   # Subversion has a .svn in all working directories.
   if os.path.isdir(os.path.join(real_path, '.svn')):
     return SVN(options, path)
 
   # Git has a command to test if you're in a git tree.
   # Try running it, but don't die if we don't have git installed.
   try:
-    gclient_utils.CheckCall(['git', 'rev-parse', '--is-inside-work-tree'],
-                            cwd=real_path)
+    subprocess2.check_output(
+        ['git', 'rev-parse', '--is-inside-work-tree'], cwd=real_path,
+        stdout=subprocess2.VOID)
     return GIT(options, path)
-  except gclient_utils.CheckCallError, e:
+  except subprocess2.CalledProcessError, e:
     if e.returncode != errno.ENOENT and e.returncode != 128:
       # ENOENT == 2 = they don't have git installed.
       # 128 = git error code when not in a repo.
       logging.warning('Unexpected error code: %s' % e.returncode)
       raise
   raise NoTryServerAccess("Could not guess version control system. "
                           "Are you in a working copy directory?")
 
 
 def GetMungedDiff(path_diff, diff):
@@ skipping 303 matching lines @@
     return 1
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, e
     return 1
   return 0
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
   sys.exit(TryChange(None, [], False))