Get generate_dump compiling on Windows

util/util.gyp

 # Copyright 2014 The Crashpad Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 11 matching lines @@
       'type': 'static_library',
       'dependencies': [
         '../compat/compat.gyp:crashpad_compat',
         '../third_party/mini_chromium/mini_chromium.gyp:base',
       ],
       'include_dirs': [
         '..',
         '<(INTERMEDIATE_DIR)',
       ],
       'sources': [
+        'file/basename.h',
+        'file/basename_posix.cc',
+        'file/basename_win.cc',
         'file/file_io.cc',
         'file/file_io.h',
         'file/file_io_posix.cc',
         'file/file_io_win.cc',
         'file/file_reader.cc',
         'file/file_reader.h',
         'file/file_seeker.cc',
         'file/file_seeker.h',
         'file/file_writer.cc',
         'file/file_writer.h',
@@ skipping 176 matching lines @@
             'libraries': [
               '-lrpcrt4.lib',
               '-lwinhttp.lib',
             ],
           },
         }],
       ],
     },
   ],
 }