chromeos: Fix shared linking.

chrome/chrome_browser.gypi

 # Copyright (c) 2010 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 3453 matching lines @@
             ['exclude', 'browser/dom_ui/slideshow_ui.cc'],
             ['exclude', 'browser/extensions/extension_tts_api_chromeos.cc'],
             ['exclude', 'browser/oom_priority_manager.cc'],
             ['exclude', 'browser/oom_priority_manager.h'],
             ['exclude', 'browser/renderer_host/offline_resource_handler.cc'],
             ['exclude', 'browser/renderer_host/offline_resource_handler.h'],
           ],
         }],
         ['chromeos==1', {
           'sources!': [
+            'browser/background_mode_manager_linux.cc',
             'browser/password_manager/native_backend_gnome_x.h',
             'browser/password_manager/native_backend_gnome_x.cc',
             'browser/password_manager/native_backend_kwallet_x.h',
             'browser/password_manager/native_backend_kwallet_x.cc',
             'browser/platform_util_linux.cc',
           ],
           'link_settings': {
             'libraries': [
               '-lpulse',
             ],
@@ skipping 923 matching lines @@
       ],
     },
   ],
 }
 
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