Replace OSError by the correct class IOError

checkout.py

 # coding=utf8
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Manages a project checkout.
 
 Includes support for svn, git-svn and git.
 """
 
 from __future__ import with_statement
@@ skipping 24 matching lines @@
       for line in settings_file.readlines():
         if not line or line.startswith('#'):
           continue
         if not ':' in line:
           # Invalid file.
           return None
         k, v = line.split(':', 1)
         settings[k.strip()] = v.strip()
     finally:
       settings_file.close()
-  except OSError:
+  except IOError:
     return None
   return settings.get(key, None)
 
 
 class PatchApplicationFailed(Exception):
   """Patch failed to be applied."""
   def __init__(self, filename, status):
     super(PatchApplicationFailed, self).__init__(filename, status)
     self.filename = filename
     self.status = status
@@ skipping 651 matching lines @@
         user, message))
     return 'FAKE'
 
   @property
   def project_name(self):
     return self.checkout.project_name
 
   @property
   def project_path(self):
     return self.checkout.project_path