Remove unused imports in webkitpy with using autoflake.

third_party/WebKit/Tools/Scripts/webkitpy/tool/multicommandtool_unittest.py

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-import sys
 import unittest
 
 from optparse import make_option
 
 from webkitpy.common.system.outputcapture import OutputCapture
 from webkitpy.tool.multicommandtool import MultiCommandTool, Command, TryAgain
 
 
 class TrivialCommand(Command):
     name = "trivial"
@@ skipping 145 matching lines @@
         tool = TrivialTool(commands=[command_with_options])
         expected_subcommand_help = """trivial [options]   help text
 
 trivial command long help text
 
 Options:
   --my_option=MY_OPTION
 
 """
         self._assert_tool_main_outputs(tool, ["tool", "help", "trivial"], expected_subcommand_help)