Revert of Remove configuration policy from chrome build files.

chrome/browser/extensions/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/features.gni")
 import("//build/config/ui.gni")
 
 assert(enable_extensions)
 
 gypi_values =
@@ skipping 29 matching lines @@
     "//chrome/app/theme:theme_resources",
     "//chrome/browser/devtools",
     "//chrome/common",
     "//chrome/common/extensions/api:api_registration",
     "//chrome/common/safe_browsing:proto",
     "//chrome/installer/util:with_no_strings",
     "//components/copresence",
     "//components/data_reduction_proxy/proto:data_reduction_proxy_proto",
     "//components/dom_distiller/core",
     "//components/onc",
-    "//components/policy",
     "//components/proximity_auth",
     "//components/resources",
     "//components/strings",
     "//components/update_client",
     "//components/url_matcher",
     "//content/app/resources",
     "//content/public/common",
     "//crypto",
     "//device/bluetooth",
     "//device/hid",
@@ skipping 95 matching lines @@
       ]
     }
     if (!is_chromeos) {
       sources += rebase_path(
               gypi_values.chrome_browser_extensions_input_ime_linux_win_sources,
               ".",
               "//chrome")
     }
   }
 
+  if (enable_configuration_policy) {
+    deps += [ "//components/policy" ]
+    sources += [
+      "policy_handlers.cc",
+      "policy_handlers.h",
+    ]
+    sources += rebase_path(gypi_values.chrome_browser_extensions_policy_sources,
+                           ".",
+                           "//chrome")
+  }
+
   if (enable_webrtc) {
     sources += [ "api/webrtc_logging_private/webrtc_logging_private_api.cc" ]
   } else {
     sources +=
         [ "api/webrtc_logging_private/webrtc_logging_private_api_stub.cc" ]
   }
 
   if (use_brlapi) {
     deps += [ "//build/linux:libbrlapi" ]
     sources += rebase_path(gypi_values.chrome_browser_extensions_brlapi_sources,
@@ skipping 42 matching lines @@
                     "//chrome")
   }
 
   if (is_chromeos && use_ozone) {
     sources -= [ "global_shortcut_listener_chromeos.cc" ]
   }
   if (!use_ozone) {
     sources -= [ "global_shortcut_listener_ozone.cc" ]
   }
 }