detect cpu feature for all x64 and x86 platforms (no longer windows only).

base/base.gypi

 # Copyright (c) 2011 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 492 matching lines @@
             'dependencies': [
               '../third_party/nss/nss.gyp:nss',
             ],
         },],
         [ 'OS != "win"', {
             'dependencies': ['../third_party/libevent/libevent.gyp:libevent'],
             'sources!': [
               'third_party/purify/pure_api.c',
               'base_drag_source.cc',
               'base_drop_target.cc',
-              'cpu.cc',
               'crypto/capi_util.h',
               'crypto/capi_util.cc',
               'event_recorder.cc',
               'file_version_info.cc',
               'pe_image.cc',
               'registry.cc',
               'resource_util.cc',
               'win_util.cc',
             ],
         },],
@@ skipping 211 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }