Making ShowExtensionInstallDialog a callback

chrome/chrome_browser_extensions.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 410 matching lines @@
         'browser/extensions/extension_info_map.cc',
         'browser/extensions/extension_info_map.h',
         'browser/extensions/extension_infobar_delegate.cc',
         'browser/extensions/extension_infobar_delegate.h',
         'browser/extensions/extension_input_api.cc',
         'browser/extensions/extension_input_api.h',
         'browser/extensions/extension_input_method_api.cc',
         'browser/extensions/extension_input_method_api.h',
         'browser/extensions/extension_input_module_constants.cc',
         'browser/extensions/extension_input_module_constants.h',
-        'browser/extensions/extension_install_dialog.cc',
-        'browser/extensions/extension_install_dialog.h',
         'browser/extensions/extension_install_prompt.cc',
         'browser/extensions/extension_install_prompt.h',
         'browser/extensions/extension_install_ui.cc',
         'browser/extensions/extension_install_ui.h',
         'browser/extensions/extension_install_ui_default.cc',
         'browser/extensions/extension_install_ui_default.h',
         'browser/extensions/extension_keybinding_registry.cc',
         'browser/extensions/extension_keybinding_registry.h',
         'browser/extensions/extension_module.cc',
         'browser/extensions/extension_module.h',
@@ skipping 397 matching lines @@
             'browser/extensions/app_host/update.cc',
             'browser/extensions/app_host/update.h',
             '<(SHARED_INTERMEDIATE_DIR)/chrome_version/app_host_exe_version.rc',
           ],
         },
       ],
     }, ],  # 'OS=="win"'
   ],  # 'conditions'
 }