Update the CrxInstaller and UnpackedInstaller to use the ExtensionInstallChecker

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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 186 matching lines @@
         'browser/extensions/extension_gcm_app_handler.cc',
         'browser/extensions/extension_gcm_app_handler.h',
         'browser/extensions/extension_icon_manager.cc',
         'browser/extensions/extension_icon_manager.h',
         'browser/extensions/extension_install_checker.cc',
         'browser/extensions/extension_install_checker.h',
         'browser/extensions/extension_install_prompt.cc',
         'browser/extensions/extension_install_prompt.h',
         'browser/extensions/extension_install_prompt_experiment.cc',
         'browser/extensions/extension_install_prompt_experiment.h',
-        'browser/extensions/extension_installer.cc',
-        'browser/extensions/extension_installer.h',
         'browser/extensions/extension_keybinding_registry.cc',
         'browser/extensions/extension_keybinding_registry.h',
         'browser/extensions/extension_message_bubble_controller.cc',
         'browser/extensions/extension_message_bubble_controller.h',
         'browser/extensions/extension_renderer_state.cc',
         'browser/extensions/extension_renderer_state.h',
         'browser/extensions/extension_resource_protocols.cc',
         'browser/extensions/extension_resource_protocols.h',
         'browser/extensions/extension_service.cc',
         'browser/extensions/extension_service.h',
@@ skipping 961 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/extensions/api/cast_channel/cast_channel.proto' ],
       'variables': {
           'proto_in_dir': 'browser/extensions/api/cast_channel',
           'proto_out_dir': 'chrome/browser/extensions/api/cast_channel',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }