Cleanup most pylint errors in json_schema_compiler.

tools/json_schema_compiler/model.py

 # Copyright (c) 2012 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.
 
 import os.path
 
 from json_parse import OrderedDict
 from memoize import memoize
 
 
@@ skipping 286 matching lines @@
     options = json.get('options', {})
     self.conditions = options.get('conditions', [])
     self.actions = options.get('actions', [])
     self.supports_listeners = options.get('supportsListeners', True)
     self.supports_rules = options.get('supportsRules', False)
     self.supports_dom = options.get('supportsDom', False)
 
     def GeneratePropertyFromParam(p):
       return Property(self, p['name'], p, namespace, origin)
 
-    self.filters = [GeneratePropertyFromParam(filter)
-                    for filter in json.get('filters', [])]
+    self.filters = [GeneratePropertyFromParam(filter_instance)
+                    for filter_instance in json.get('filters', [])]
     callback_param = None
     for param in json.get('parameters', []):
       if param.get('type') == 'function':
         if callback_param:
           # No ParseException because the webstore has this.
           # Instead, pretend all intermediate callbacks are properties.
           self.params.append(GeneratePropertyFromParam(callback_param))
         callback_param = param
       else:
         self.params.append(GeneratePropertyFromParam(param))
@@ skipping 277 matching lines @@
   # Sanity check: platforms should not be an empty list.
   if not json['platforms']:
     raise ValueError('"platforms" cannot be an empty list')
   platforms = []
   for platform_name in json['platforms']:
     for platform_enum in _Enum.GetAll(Platforms):
       if platform_name == platform_enum.name:
         platforms.append(platform_enum)
         break
   return platforms