Remove a bunch of unused webkitpy code from tool/, common/checkout/ and common/config/

Tools/Scripts/webkitpy/tool/commands/stepsequence.py

 # Copyright (C) 2009 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 13 matching lines @@
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import logging
 import sys
 
 from webkitpy.tool import steps
 
-from webkitpy.common.checkout.scm import CheckoutNeedsUpdate
 from webkitpy.common.system.executive import ScriptError
 
 _log = logging.getLogger(__name__)
 
 
 class StepSequenceErrorHandler():
     @classmethod
     def handle_script_error(cls, tool, patch, script_error):
         raise NotImplementedError, "subclasses must implement"
 
@@ skipping 27 matching lines @@
     @classmethod
     def exit_after_handled_error(cls, error):
         _log.error(error)
         sys.exit(cls.handled_error_code)
 
     def run_and_handle_errors(self, tool, options, state=None):
         if not state:
             state = {}
         try:
             self._run(tool, options, state)
-        except CheckoutNeedsUpdate, e:
-            _log.info("Commit failed because the checkout is out of date. Please update and try again.")
-            if options.parent_command:
-                command = tool.command_by_name(options.parent_command)
-                command.handle_checkout_needs_update(tool, state, options, e)
-            self.exit_after_handled_error(e)
         except ScriptError, e:
             if not options.quiet:
                 _log.error(e.message_with_output())
             if options.parent_command:
                 command = tool.command_by_name(options.parent_command)
                 command.handle_script_error(tool, state, e)
             self.exit_after_handled_error(e)