Experimentally isolate GetOpenFileName in a utility process.

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 242 matching lines @@
       'browser/chrome_content_browser_client.cc',
       'browser/chrome_content_browser_client.h',
       'browser/chrome_content_browser_client_parts.h',
       'browser/chrome_elf_init_win.cc',
       'browser/chrome_elf_init_win.h',
       'browser/chrome_notification_types.h',
       'browser/chrome_page_zoom.cc',
       'browser/chrome_page_zoom.h',
       'browser/chrome_page_zoom_constants.cc',
       'browser/chrome_page_zoom_constants.h',
+      'browser/chrome_select_file_dialog_factory_win.cc',
+      'browser/chrome_select_file_dialog_factory_win.h',
       'browser/chrome_quota_permission_context.cc',
       'browser/chrome_quota_permission_context.h',
       'browser/command_observer.h',
       'browser/command_updater.cc',
       'browser/command_updater.h',
       'browser/command_updater_delegate.h',
       'browser/component_updater/background_downloader_win.cc',
       'browser/component_updater/background_downloader_win.h',
       'browser/component_updater/cld_component_installer.cc',
       'browser/component_updater/cld_component_installer.h',
@@ skipping 3341 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }