Remove unused code from tool/main.py

Tools/Scripts/webkitpy/tool/mocktool.py

Index: Tools/Scripts/webkitpy/tool/mocktool.py
diff --git a/Tools/Scripts/webkitpy/tool/mocktool.py b/Tools/Scripts/webkitpy/tool/mocktool.py
index de8d3be89460e007c8cde5d88f9686aee1201584..f806a7aed0f8f2d80adf6957473e581d8acfe797 100644
--- a/Tools/Scripts/webkitpy/tool/mocktool.py
+++ b/Tools/Scripts/webkitpy/tool/mocktool.py
@@ -26,8 +26,6 @@
 # (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 threading
-
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.net.buildbot.buildbot_mock import MockBuildBot
 
@@ -64,8 +62,6 @@ class MockTool(MockHost):
 
         self._deprecated_port = MockPort()
 
-        self.wakeup_event = threading.Event()
-
     def deprecated_port(self):
         return self._deprecated_port