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

Tools/Scripts/webkitpy/common/host_mock.py

 # Copyright (C) 2011 Google Inc. All rights reserved.
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-from webkitpy.common.checkout.checkout_mock import MockCheckout
 from webkitpy.common.checkout.scm.scm_mock import MockSCM
 from webkitpy.common.net.buildbot.buildbot_mock import MockBuildBot
 from webkitpy.common.net.web_mock import MockWeb
 from webkitpy.common.system.systemhost_mock import MockSystemHost
 
 # New-style ports need to move down into webkitpy.common.
 from webkitpy.layout_tests.port.factory import PortFactory
 from webkitpy.layout_tests.port.test import add_unit_tests_to_mock_filesystem
 
 
 class MockHost(MockSystemHost):
     def __init__(self, log_executive=False, executive_throws_when_run=None, initialize_scm_by_default=True, web=None):
         MockSystemHost.__init__(self, log_executive, executive_throws_when_run)
         add_unit_tests_to_mock_filesystem(self.filesystem)
         self.web = web or MockWeb()
 
-        self._checkout = MockCheckout()
         self._scm = None
         # FIXME: we should never initialize the SCM by default, since the real
         # object doesn't either. This has caused at least one bug (see bug 89498).
         if initialize_scm_by_default:
             self.initialize_scm()
         self.buildbot = MockBuildBot()
         self._chromium_buildbot = MockBuildBot()
 
         # Note: We're using a real PortFactory here.  Tests which don't wish to depend
         # on the list of known ports should override this with a MockPortFactory.
         self.port_factory = PortFactory(self)
 
     def initialize_scm(self, patch_directories=None):
         self._scm = MockSCM(filesystem=self.filesystem, executive=self.executive)
         # Various pieces of code (wrongly) call filesystem.chdir(checkout_root).
         # Making the checkout_root exist in the mock filesystem makes that chdir not raise.
         self.filesystem.maybe_make_directory(self._scm.checkout_root)
 
     def scm(self):
         return self._scm
 
     def checkout(self):
         return self._checkout
 
     def chromium_buildbot(self):
         return self._chromium_buildbot