Build/use constructormagic.h unconditionally.

webrtc/base/base.gyp

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 377 matching lines @@
           ],
           'sources': [
             '../../webrtc_overrides/webrtc/base/win32socketinit.cc',
           ],
           'sources!': [
             'atomicops.h',
             'bandwidthsmoother.cc',
             'bandwidthsmoother.h',
             'bind.h',
             'callback.h',
-            'constructormagic.h',
             'dbus.cc',
             'dbus.h',
             'diskcache_win32.cc',
             'diskcache_win32.h',
             'fileutils_mock.h',
             'genericslot.h',
             'httpserver.cc',
             'httpserver.h',
             'json.cc',
             'json.h',
@@ skipping 264 matching lines @@
           ],
         }, {
           'include_dirs': [
             '<(ssl_root)',
           ],
         }],
       ],
     },
   ],
 }