Add chrome/browser/extensions to "GN check"

components/signin/core/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.
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 static_library("browser") {
   sources = [
@@ skipping 56 matching lines @@
     "signin_tracker.cc",
     "signin_tracker.h",
     "webdata/token_service_table.cc",
     "webdata/token_service_table.h",
     "webdata/token_web_data.cc",
     "webdata/token_web_data.h",
   ]
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
+  public_deps = [
+    "//components/signin/core/account_id",
+    "//components/signin/core/common",
+  ]
   deps = [
     "//base",
     "//base:i18n",
     "//components/content_settings/core/browser",
     "//components/content_settings/core/common",
     "//components/google/core/browser",
     "//components/invalidation/public",
     "//components/keyed_service/core",
     "//components/metrics",
     "//components/os_crypt",
     "//components/pref_registry",
     "//components/prefs",
-    "//components/signin/core/account_id",
-    "//components/signin/core/common",
     "//components/webdata/common",
     "//crypto",
     "//google_apis",
     "//net",
     "//sql",
     "//third_party/icu",
   ]
 
   if (is_chromeos) {
     sources -= [
@@ skipping 71 matching lines @@
 }
 
 if (is_android) {
   # GYP: //component/signin.gypi:investigated_scenario_java
   java_cpp_enum("investigated_scenario_java") {
     sources = [
       "signin_investigator.h",
     ]
   }
 }