Remove remaining unused imports in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/test.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 11 matching lines @@
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # 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 base64
 import time
 
+from webkitpy.common.system.crashlogs import CrashLogs
+from webkitpy.layout_tests.models import test_run_results
+from webkitpy.layout_tests.models.test_configuration import TestConfiguration
 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
 
 
 # This sets basic expectations for a test. Each individual expectation
 # can be overridden by a keyword argument in TestList.add().
 class TestInstance(object):
 
     def __init__(self, name):
         self.name = name
         self.base = name[(name.rfind("/") + 1):name.rfind(".")]
         self.crash = False
@@ skipping 580 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