[WebUI] Narrow the scope of chrome/browser/resources/PRESUBMIT.py.

chrome/browser/resources/PRESUBMIT.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.
 
 """Presubmit script for Chromium WebUI resources.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl/git cl, and see
 http://www.chromium.org/developers/web-development-style-guide for the rules
 we're checking against here.
@@ skipping 26 matching lines @@
     results.extend(
         input_api.canned_checks.RunUnitTests(input_api, output_api, tests))
 
   import sys
   old_path = sys.path
 
   try:
     sys.path = [resources] + old_path
     from web_dev_style import css_checker, js_checker
 
-    def is_resource(f):
-      return f.LocalPath().endswith(('.css', '.html', '.js'))
+    def is_resource(maybe_resource):
+      f = maybe_resource.AbsoluteLocalPath()
+      return f.endswith(('.css', '.html', '.js')) and f.startswith(resources)
 
     results.extend(css_checker.CSSChecker(input_api, output_api,
                                           file_filter=is_resource).RunChecks())
     results.extend(js_checker.JSChecker(input_api, output_api,
                                         file_filter=is_resource).RunChecks())
   finally:
     sys.path = old_path
 
   return results