Remove unused imports in webkitpy.

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

 # Copyright 2014 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 flakytests
 
-from webkitpy.common.checkout.scm.scm_mock import MockSCM
 from webkitpy.layout_tests.layout_package import bot_test_expectations
 from webkitpy.layout_tests.port import builders
 from webkitpy.tool.commands.commandtest import CommandsTest
 from webkitpy.tool.mocktool import MockTool, MockOptions
 
 class FakeBotTestExpectations(object):
     def expectation_lines(self, only_ignore_very_flaky=False):
         return []
 
 
@@ skipping 52 matching lines @@
         command = flakytests.FlakyTests()
         tool = MockTool()
         command.expectations_factory = FakeBotTestExpectationsFactory
         options = MockOptions(upload=True)
         expected_stdout = flakytests.FlakyTests.OUTPUT % (
             flakytests.FlakyTests.HEADER,
             '',
             flakytests.FlakyTests.FLAKINESS_DASHBOARD_URL % '') + '\n'
 
         self.assert_execute_outputs(command, options=options, tool=tool, expected_stdout=expected_stdout)