Remove unnecessary semicolons from Python code.

lib/dom/scripts/systembase.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides base functionality for systems to generate
 Dart APIs from the IDL database."""
 
 import os
 from generator import *
@@ skipping 81 matching lines @@
         if self._database.HasInterface(parent.type.id):
           parent_interface = self._database.GetInterface(parent.type.id)
           for attr in parent_interface.attributes:
             result.add(attr.id)
           for op in parent_interface.operations:
             result.add(op.id)
           WalkParentChain(parent_interface)
 
     result = set()
     WalkParentChain(interface)
-    return result;
+    return result
 
 class BaseGenerator(object):
   def __init__(self, database, interface):
     self._database = database
     self._interface = interface
 
   def Generate(self):
     self.StartInterface()
     self.AddMembers(self._interface)
     self.AddSecondaryMembers(self._interface)
@@ skipping 101 matching lines @@
           result.append(parent_interface)
           walk(parent_interface.parents)
 
     result = []
     if interface.parents:
       parent = interface.parents[0]
       if IsPureInterface(parent.type.id):
         walk(interface.parents)
       else:
         walk(interface.parents[1:])
-    return result;
+    return result
 
 
 def _PairUpAttributes(attributes):
   """Returns a list of (getter, setter) pairs sorted by name.
 
   One element of the pair may be None.
   """
   names = sorted(set(attr.id for attr in attributes))
   getters = {}
   setters = {}
   for attr in attributes:
     if attr.is_fc_getter:
       getters[attr.id] = attr
     elif attr.is_fc_setter and 'Replaceable' not in attr.ext_attrs:
       setters[attr.id] = attr
   return [(getters.get(id), setters.get(id)) for id in names]