Introduce WebRequestEventRouterDelegate.

extensions/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 
 # GYP version: extensions/extensions.gyp:extensions_browser
 source_set("browser") {
   sources = [
@@ skipping 205 matching lines @@
       "api/usb_private/usb_private_api.cc",
       "api/usb_private/usb_private_api.h",
       "api/web_request/web_request_api_constants.cc",
       "api/web_request/web_request_api_constants.h",
       "api/web_request/web_request_api_helpers.cc",
       "api/web_request/web_request_api_helpers.h",
       "api/web_request/web_request_api_utils.cc",
       "api/web_request/web_request_api_utils.h",
       "api/web_request/web_request_permissions.cc",
       "api/web_request/web_request_permissions.h",
+      "api/web_request/web_request_event_router_delegate.cc",
+      "api/web_request/web_request_event_router_delegate.h",
       "api/web_view/web_view_internal_api.cc",
       "api/web_view/web_view_internal_api.h",
       "api_activity_monitor.h",
       "app_sorting.h",
       "app_window/app_delegate.h",
       "app_window/app_web_contents_helper.cc",
       "app_window/app_web_contents_helper.h",
       "app_window/app_window.cc",
       "app_window/app_window.h",
       "app_window/app_window_client.cc",
@@ skipping 213 matching lines @@
       ]
     }
   }
 
   if (is_win) {
     cflags = [
       "/wd4267", # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     ]
   }
 }