Remove all unused variables.

third_party/WebKit/Tools/Scripts/webkitpy/common/system/executive.py

 # Copyright (c) 2009, Google Inc. All rights reserved.
 # Copyright (c) 2009 Apple 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
@@ skipping 226 matching lines @@
         if not process_name_filter:
             process_name_filter = lambda process_name: True
 
         running_pids = []
         for line in self._running_processes():
             try:
                 process_name = line[0]
                 pid = line[1]
                 if process_name_filter(process_name):
                     running_pids.append(int(pid))
-            except (ValueError, IndexError) as e:
+            except (ValueError, IndexError):
                 pass
 
         return sorted(running_pids)
 
     def process_dump(self):
         ps_process = None
         if sys.platform in ("win32", "cygwin"):
             ps_process = self.popen(
                 ['wmic', 'process', 'get',
                  'ProcessId,ParentProcessId,CommandLine'],
@@ skipping 199 matching lines @@
             pool.close()
             pool.join()
 
 
 def _run_command_thunk(cmd_line_and_cwd):
     # Note that this needs to be a bare module (and hence Picklable) method to work with multiprocessing.Pool.
     (cmd_line, cwd) = cmd_line_and_cwd
     proc = subprocess.Popen(cmd_line, cwd=cwd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     stdout, stderr = proc.communicate()
     return (proc.returncode, stdout, stderr)