Remove unused imports in webkitpy with using autoflake.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/test.py

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 import base64
-import copy
-import sys
 import time
 
 from webkitpy.layout_tests.port.base import Port, VirtualTestSuite
 from webkitpy.layout_tests.port.driver import DeviceFailure, Driver, DriverOutput
 from webkitpy.layout_tests.models.test_configuration import TestConfiguration
 from webkitpy.layout_tests.models import test_run_results
 from webkitpy.common.system.filesystem_mock import MockFileSystem
 from webkitpy.common.system.crashlogs import CrashLogs
 
 
@@ skipping 618 matching lines @@
         else:
             image = test.actual_image
         return DriverOutput(actual_text, image, test.actual_checksum, audio,
                             crash=(crash or web_process_crash), crashed_process_name=crashed_process_name,
                             crashed_pid=crashed_pid, crash_log=crash_log,
                             test_time=time.time() - start_time, timeout=test.timeout, error=test.error, pid=self.pid,
                             leak=test.leak)
 
     def stop(self):
         self.started = False