Split web_dev_style tests into separate files.

chrome/browser/PRESUBMIT.py

Index: chrome/browser/PRESUBMIT.py
diff --git a/chrome/browser/PRESUBMIT.py b/chrome/browser/PRESUBMIT.py
index 7230324123f8c5147b8dd7966d8defe7293516d6..143ff1c09d4c2afa15f49928a9084cb084195e75 100644
--- a/chrome/browser/PRESUBMIT.py
+++ b/chrome/browser/PRESUBMIT.py
@@ -31,13 +31,13 @@ def _CommonChecks(input_api, output_api):
   webui = path.join(cwd, 'ui', 'webui')
 
   affected_files = (f.AbsoluteLocalPath() for f in input_api.AffectedFiles())
-  would_affect_tests = (
+
+  would_affect_tests = [
       path.join(cwd, 'PRESUBMIT.py'),
       path.join(cwd, 'test_presubmit.py'),
-      path.join(cwd, 'web_dev_style', 'css_checker.py'),
-      path.join(cwd, 'web_dev_style', 'html_checker.py'),
-      path.join(cwd, 'web_dev_style', 'js_checker.py'),
-  )
+  ]
+  would_affect_tests += input_api.glob(path.join(cwd, 'web_dev_style', '*.py'))
+
   if any(f for f in affected_files if f in would_affect_tests):
     tests = [path.join(cwd, 'test_presubmit.py')]
     results.extend(