Stop parsing disable_outdated_build_detector.exe.pdb as a PE file

chrome/tools/build/win/FILES.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # 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.
 
 # This is a buildbot configuration file containing a tagged list of files
 # processed by the stage/archive scripts. The known tags are:
 #
@@ skipping 621 matching lines @@
     'direct_archive': 1,
     'filegroup': ['default', 'symsrc'],
     'optional': ['official'],
   },
   {
     'filename': 'disable_outdated_build_detector.exe.pdb',
     'arch': ['32bit'],
     'buildtype': ['official'],
     'archive': 'disable_outdated_build_detector.exe.pdb',
     'direct_archive': 1,
-    'filegroup': ['symsrc'],
     'optional': ['official'],
   },
   # PDB files for Syzygy modified binaries. Only add to this section if you
   # know what you're doing! The build configuration has to be modified to run
   # Syzygy on the target in question before adding a staging dependency here!
   {
     'filename': 'syzygy/chrome.dll.pdb',
     'arch': ['32bit'],
     'buildtype': ['dev', 'official'],
     'archive': 'chrome-win32-syms.zip',
@@ skipping 32 matching lines @@
     'arch': ['32bit'],
     'buildtype': ['official'],
     'archive': 'chrome-win32-nacl-irt-syms.zip',
   },
   {
     'filename': 'nacl_irt_x86_64.nexe.debug',
     'buildtype': ['official'],
     'archive': 'chrome-win32-nacl-irt-syms.zip',
   },
 ]