Move inline som functions ScopedDBusError into a .cc file

dbus/dbus.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 23 matching lines @@
         'message.cc',
         'message.h',
         'object_manager.cc',
         'object_manager.h',
         'object_path.cc',
         'object_path.h',
         'object_proxy.cc',
         'object_proxy.h',
         'property.cc',
         'property.h',
+        'scoped_dbus_error.cc',
         'scoped_dbus_error.h',
         'string_util.cc',
         'string_util.h',
         'util.cc',
         'util.h',
         'values_util.cc',
         'values_util.h',
       ],
     },
     {
@@ skipping 77 matching lines @@
         'test_server.cc',
         'test_service.cc',
         'test_service.h',
       ],
       'include_dirs': [
         '..',
       ],
     },
   ],
 }