Remove webkitpy.thirdparty.mock, webkitpy.common.webkitunittest.

Tools/Scripts/webkitpy/tool/commands/commandtest.py

Index: Tools/Scripts/webkitpy/tool/commands/commandtest.py
diff --git a/Tools/Scripts/webkitpy/tool/commands/commandtest.py b/Tools/Scripts/webkitpy/tool/commands/commandtest.py
index 655c33fdac41dc411b9578d514a2d98b16e0ea91..243291ca631581f374d7c59e3677c22fa74e51be 100644
--- a/Tools/Scripts/webkitpy/tool/commands/commandtest.py
+++ b/Tools/Scripts/webkitpy/tool/commands/commandtest.py
@@ -26,12 +26,13 @@
 # (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 unittest
+
 from webkitpy.common.system.outputcapture import OutputCapture
-from webkitpy.common.webkitunittest import TestCase
 from webkitpy.tool.mocktool import MockOptions, MockTool
 
 
-class CommandsTest(TestCase):
+class CommandsTest(unittest.TestCase):
     def assert_execute_outputs(self, command, args=[], expected_stdout="", expected_stderr="", expected_exception=None, expected_logs=None, options=MockOptions(), tool=MockTool()):
         options.blocks = None
         options.cc = 'MOCK cc'