Fixing check_orphan_headers on Windows

PRESUBMIT.py

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import json
 import os
@@ skipping 557 matching lines @@
       input_api, output_api))
   results.extend(_CheckNativeApiHeaderChanges(input_api, output_api))
   results.extend(_CheckNoIOStreamInHeaders(input_api, output_api))
   results.extend(_CheckNoPragmaOnce(input_api, output_api))
   results.extend(_CheckNoFRIEND_TEST(input_api, output_api))
   results.extend(_CheckGnChanges(input_api, output_api))
   results.extend(_CheckUnwantedDependencies(input_api, output_api))
   results.extend(_CheckJSONParseErrors(input_api, output_api))
   results.extend(_RunPythonTests(input_api, output_api))
   results.extend(_CheckUsageOfGoogleProtobufNamespace(input_api, output_api))
-  # Disabling this because it seems to have a bug when running on Windows.
-  # TODO(mbonadei): fix this and re-enable this check.
-  # BUG: https://bugs.chromium.org/p/webrtc/issues/detail?id=7635
-  # results.extend(_CheckOrphanHeaders(input_api, output_api))
+  results.extend(_CheckOrphanHeaders(input_api, output_api))
   return results
 
 
 def CheckChangeOnUpload(input_api, output_api):
   results = []
   results.extend(_CommonChecks(input_api, output_api))
   results.extend(
       input_api.canned_checks.CheckGNFormatted(input_api, output_api))
   return results
 
@@ skipping 37 matching lines @@
     if f.LocalPath().endswith('.h') and f.Action() == 'A':
       file_path = os.path.abspath(f.LocalPath())
       root_dir = os.getcwd()
       gn_file_path = GetBuildGnPathFromFilePath(file_path, os.path.exists,
                                                 root_dir)
       in_build_gn = IsHeaderInBuildGn(file_path, gn_file_path)
       if not in_build_gn:
         results.append(output_api.PresubmitError(error_msg.format(
             file_path, gn_file_path)))
   return results