Remove unused imports in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_unittest.py

 # Copyright (C) 2010 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.
 
 import unittest
 import webkitpy.tool.commands.rebaseline
 
 from webkitpy.common.checkout.baselineoptimizer import BaselineOptimizer
-from webkitpy.common.checkout.scm.scm_mock import MockSCM
-from webkitpy.common.host_mock import MockHost
 from webkitpy.common.net.buildbot.buildbot_mock import MockBuilder
 from webkitpy.common.net.layouttestresults import LayoutTestResults
 from webkitpy.common.system.executive_mock import MockExecutive
 from webkitpy.common.system.executive_mock import MockExecutive2
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.tool.commands.rebaseline import *
 from webkitpy.tool.mocktool import MockTool, MockOptions
 
 
 class _BaseTestCase(unittest.TestCase):
@@ skipping 1423 matching lines @@
         oc.capture_output()
         self.command._do_one_rebaseline()
         out, _, _ = oc.restore_output()
 
         self.assertEqual(out, 'MOCK STDOUT\n')
         self.assertEqual(self.tool.executive.calls, [
             ['git', 'pull'],
             ['/mock-checkout/third_party/WebKit/Tools/Scripts/webkit-patch', 'auto-rebaseline', '--verbose'],
         ])
         self.assertEqual(self._logs, ['MOCK STDOUT'])