Unify UUID/GUID generation code across base and blink

base/base.gypi

 # 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.
 
 {
   'includes': [
     'trace_event/trace_event.gypi',
   ],
   'target_defaults': {
     'variables': {
@@ skipping 222 matching lines @@
           'files/memory_mapped_file_posix.cc',
           'files/memory_mapped_file_win.cc',
           'files/scoped_file.cc',
           'files/scoped_file.h',
           'files/scoped_temp_dir.cc',
           'files/scoped_temp_dir.h',
           'format_macros.h',
           'gtest_prod_util.h',
           'guid.cc',
           'guid.h',
-          'guid_posix.cc',
-          'guid_win.cc',
           'hash.cc',
           'hash.h',
           'id_map.h',
           'ios/block_types.h',
           'ios/crb_protocol_observers.h',
           'ios/crb_protocol_observers.mm',
           'ios/device_util.h',
           'ios/device_util.mm',
           'ios/ios_util.h',
           'ios/ios_util.mm',
@@ skipping 835 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }