rework css to better match gitiles

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.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
 
 _EXCLUDED_PATHS = (
     r"^breakpad[\\\/].*",
     r"^native_client_sdk[\\\/]src[\\\/]build_tools[\\\/]make_rules.py",
     r"^native_client_sdk[\\\/]src[\\\/]build_tools[\\\/]make_simple.py",
     r"^native_client_sdk[\\\/]src[\\\/]tools[\\\/].*.mk",
     r"^net[\\\/]tools[\\\/]spdyshark[\\\/].*",
     r"^skia[\\\/].*",
     r"^third_party[\\\/]WebKit[\\\/].*",
     r"^v8[\\\/].*",
     r".*MakeFile$",
     r".+_autogen\.h$",
     r".+[\\\/]pnacl_shim\.c$",
     r"^gpu[\\\/]config[\\\/].*_list_json\.cc$",
     r"^chrome[\\\/]browser[\\\/]resources[\\\/]pdf[\\\/]index.js",
     r".*vulcanized.html$",
     r".*crisper.js$",
+    r"tools[\\\/]md_browser[\\\/].*\.css$",
 )
 
 
 # Fragment of a regular expression that matches C++ and Objective-C++
 # implementation files.
 _IMPLEMENTATION_EXTENSIONS = r'\.(cc|cpp|cxx|mm)$'
 
 
 # Regular expression that matches code only used for test binaries
 # (best effort).
@@ skipping 2335 matching lines @@
       output_api,
       json_url='http://chromium-status.appspot.com/current?format=json'))
 
   results.extend(
       input_api.canned_checks.CheckPatchFormatted(input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeHasBugField(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeHasDescription(
       input_api, output_api))
   return results