Remove unused code from tool/main.py

Tools/Scripts/webkitpy/tool/main.py

Index: Tools/Scripts/webkitpy/tool/main.py
diff --git a/Tools/Scripts/webkitpy/tool/main.py b/Tools/Scripts/webkitpy/tool/main.py
index dcd236eed123bc9af95ce5ea9cf1df3f812243e6..710a08e82c90502e8da63c6b3d49658c684e478c 100644
--- a/Tools/Scripts/webkitpy/tool/main.py
+++ b/Tools/Scripts/webkitpy/tool/main.py
@@ -30,8 +30,6 @@
 # A tool for automating dealing with bugzilla, posting patches, committing patches, etc.
 
 from optparse import make_option
-import os
-import threading
 
 from webkitpy.common.host import Host
 from webkitpy.tool.multicommandtool import MultiCommandTool
@@ -48,7 +46,6 @@ class WebKitPatch(MultiCommandTool, Host):
         MultiCommandTool.__init__(self)
         Host.__init__(self)
         self._path = path
-        self.wakeup_event = threading.Event()
 
     def path(self):
         return self._path