Fix running default browser check/setting in UI thread on Linux....

chrome/chrome.gyp

 # Copyright (c) 2009 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,
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 1496 matching lines @@
         'browser/sessions/session_service.h',
         'browser/sessions/session_types.cc',
         'browser/sessions/session_types.h',
         'browser/sessions/tab_restore_service.cc',
         'browser/sessions/tab_restore_service.h',
         'browser/shell_dialogs.h',
         'browser/shell_integration.cc',
         'browser/shell_integration.h',
         'browser/shell_integration_mac.mm',
         'browser/shell_integration_linux.cc',
+        'browser/shell_integration_win.cc',
         'browser/spellcheck_worditerator.cc',
         'browser/spellcheck_worditerator.h',
         'browser/spellchecker.cc',
         'browser/spellchecker.h',
         'browser/spellchecker_common.h',
         'browser/spellchecker_linux.cc',
         'browser/spellchecker_mac.mm',
         'browser/spellchecker_platform_engine.h',
         'browser/spellchecker_win.cc',
         'browser/ssl/ssl_blocking_page.cc',
@@ skipping 777 matching lines @@
             'browser/google_update.cc',
             'browser/history/history_indexer.idl',
             'browser/history_tab_ui.cc',
             'browser/history_view.cc',
             'browser/ime_input.cc',
             'browser/importer/ie_importer.cc',
             'browser/jumplist.cc',
             'browser/memory_details.cc',
             'browser/modal_html_dialog_delegate.cc',
             'browser/sandbox_policy.cc',
-            'browser/shell_integration.cc',
             'browser/tab_contents/web_drag_source.cc',
             'browser/tab_contents/web_drop_target.cc',
           ],
         }],
       ],
     },
     {
       'target_name': 'debugger',
       'type': '<(library)',
       'msvs_guid': '57823D8C-A317-4713-9125-2C91FDFD12D6',
@@ skipping 2833 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }