Use underscores to separate words in filenames in webkitpy.

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

 # Copyright (C) 2011 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 12 matching lines @@
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # 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.
 
 from webkitpy.common.config.builders import BUILDERS
 from webkitpy.common.checkout.scm.scm_mock import MockSCM
 from webkitpy.common.net.buildbot_mock import MockBuildBot
 from webkitpy.common.net.web_mock import MockWeb
-from webkitpy.common.system.systemhost_mock import MockSystemHost
+from webkitpy.common.system.system_host_mock import MockSystemHost
 
 # New-style ports need to move down into webkitpy.common.
 from webkitpy.layout_tests.builder_list import BuilderList
 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,
@@ skipping 26 matching lines @@
         # 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 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