Remove base/win/metro.{cc|h} and some associated code

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 714 matching lines @@
           'win/event_trace_provider.cc',
           'win/event_trace_provider.h',
           'win/i18n.cc',
           'win/i18n.h',
           'win/iat_patch_function.cc',
           'win/iat_patch_function.h',
           'win/iunknown_impl.cc',
           'win/iunknown_impl.h',
           'win/message_window.cc',
           'win/message_window.h',
-          'win/metro.cc',
-          'win/metro.h',
           'win/object_watcher.cc',
           'win/object_watcher.h',
           'win/process_startup_helper.cc',
           'win/process_startup_helper.h',
           'win/registry.cc',
           'win/registry.h',
           'win/resource_util.cc',
           'win/resource_util.h',
           'win/scoped_bstr.cc',
           'win/scoped_bstr.h',
@@ skipping 307 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }