| Index: ui/webui/resources/PRESUBMIT.py | 
| diff --git a/ui/webui/resources/PRESUBMIT.py b/ui/webui/resources/PRESUBMIT.py | 
| index ec4af5971315e50f4e200de1270e6eb40c911eea..2b24710521a56d345f66233494aa4d7e1bc655db 100644 | 
| --- a/ui/webui/resources/PRESUBMIT.py | 
| +++ b/ui/webui/resources/PRESUBMIT.py | 
| @@ -61,7 +61,7 @@ def _CommonChecks(input_api, output_api): | 
| check_js=True) | 
| try: | 
| import sys | 
| -    old_sys_path = sys.path | 
| +    old_sys_path = sys.path[:] | 
| cwd = input_api.PresubmitLocalPath() | 
| sys.path += [input_api.os_path.join(cwd, '..', '..', '..', 'tools')] | 
| from web_dev_style import presubmit_support | 
|  |