Add PolicyProvider to ExtensionManagement

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 14 matching lines @@
     "//third_party/leveldatabase",
   ]
 
   if (enable_extensions) {
     # Includes all API implementations and the ExtensionsApiClient
     # interface. Moving an API from src/chrome to src/extensions implies
     # it can be cleanly disabled with enable_extensions=false.
     # TODO: Eventually the entire extensions module should not be built
     # when enable_extensions=false.
     sources += [
-      "admin_policy.cc",
-      "admin_policy.h",
       "api/api_resource.cc",
       "api/api_resource.h",
       "api/api_resource_manager.h",
       "api/app_runtime/app_runtime_api.cc",
       "api/app_runtime/app_runtime_api.h",
       "api/app_view/app_view_internal_api.cc",
       "api/app_view/app_view_internal_api.h",
       "api/app_window/app_window_api.cc",
       "api/app_window/app_window_api.h",
       "api/guest_view/guest_view_internal_api.cc",
@@ skipping 322 matching lines @@
       ]
     }
   }
 
   if (is_win) {
     cflags = [
       "/wd4267", # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     ]
   }
 }