Empty webkitpy/common/net/buildbot/__init__.py and update imports.

third_party/WebKit/Tools/Scripts/webkitpy/common/host_mock.py

 # Copyright (C) 2011 Google Inc. All rights reserved.
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 #    * Redistributions of source code must retain the above copyright
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 # in the documentation and/or other materials provided with the
 # distribution.
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 # this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 from webkitpy.common.checkout.scm.scm_mock import MockSCM
-from webkitpy.common.net.buildbot.buildbot_mock import MockBuildBot
+from webkitpy.common.net.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):
 
@@ skipping 23 matching lines @@
     def scm(self):
         return self._scm
 
     def scm_for_path(self, path):
         # FIXME: consider supporting more than one SCM so that we can do more comprehensive testing.
         self.initialize_scm()
         return self._scm
 
     def checkout(self):
         return self._checkout