Remove remaining unused imports in webkitpy.

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

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import optparse
 
 from webkitpy.common.net.buildbot import Build
+from webkitpy.common.net.git_cl import GitCL
 from webkitpy.common.net.rietveld import Rietveld
 from webkitpy.common.net.web_mock import MockWeb
-from webkitpy.common.net.git_cl import GitCL
-from webkitpy.common.system.executive_mock import MockExecutive2
 from webkitpy.common.system.logtesting import LoggingTestCase
 from webkitpy.layout_tests.builder_list import BuilderList
 from webkitpy.tool.commands.rebaseline_cl import RebaselineCL
 from webkitpy.tool.commands.rebaseline_unittest import BaseTestCase
 
 
 class RebaselineCLTest(BaseTestCase, LoggingTestCase):
     command_constructor = RebaselineCL
 
     def setUp(self):
@@ skipping 208 matching lines @@
         self.assertTrue(self.command.trigger_jobs_for_missing_builds([
             Build('MOCK Try Linux', None),
         ]))
         self.assertEqual(self.tool.executive.calls, [['git', 'cl', 'try', '-b', 'MOCK Try Win']])
         self.assertLog([
             'INFO: There are existing pending builds for:\n',
             'INFO:   MOCK Try Linux\n',
             'INFO: Triggering try jobs for:\n',
             'INFO:   MOCK Try Win\n',
         ])