[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/extensions.gypi

 # Copyright 2015 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': {
     'extensions_common_constants_sources': [
       'common/constants.cc',
       'common/constants.h',
     ],
@@ skipping 627 matching lines @@
       'browser/guest_view/extension_options/extension_options_constants.cc',
       'browser/guest_view/extension_options/extension_options_constants.h',
       'browser/guest_view/extension_options/extension_options_guest.cc',
       'browser/guest_view/extension_options/extension_options_guest.h',
       'browser/guest_view/extension_options/extension_options_guest_delegate.cc',
       'browser/guest_view/extension_options/extension_options_guest_delegate.h',
       'browser/guest_view/extension_view/extension_view_constants.cc',
       'browser/guest_view/extension_view/extension_view_constants.h',
       'browser/guest_view/extension_view/extension_view_guest.cc',
       'browser/guest_view/extension_view/extension_view_guest.h',
-      'browser/guest_view/extension_view/extension_view_guest_delegate.cc',
-      'browser/guest_view/extension_view/extension_view_guest_delegate.h',
       'browser/guest_view/extensions_guest_view_manager_delegate.cc',
       'browser/guest_view/extensions_guest_view_manager_delegate.h',
       'browser/guest_view/extensions_guest_view_message_filter.cc',
       'browser/guest_view/extensions_guest_view_message_filter.h',
       'browser/guest_view/mime_handler_view/mime_handler_stream_manager.cc',
       'browser/guest_view/mime_handler_view/mime_handler_stream_manager.h',
       'browser/guest_view/mime_handler_view/mime_handler_view_constants.cc',
       'browser/guest_view/mime_handler_view/mime_handler_view_constants.h',
       'browser/guest_view/mime_handler_view/mime_handler_view_guest.cc',
       'browser/guest_view/mime_handler_view/mime_handler_view_guest.h',
@@ skipping 389 matching lines @@
       'test/result_catcher.h',
       'test/test_content_utility_client.cc',
       'test/test_content_utility_client.h',
       'test/test_extensions_client.cc',
       'test/test_extensions_client.h',
       'test/test_permission_message_provider.cc',
       'test/test_permission_message_provider.h',
     ],
   },
 }