Add browser_extensions to GN build.

chrome/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")
 import("//build/config/ui.gni")
 import("//tools/grit/grit_rule.gni")
 
 about_credits_file = "$target_gen_dir/about_credits.html"
@@ skipping 117 matching lines @@
     #        '<(SHARED_INTERMEDIATE_DIR)/chrome/browser/metrics/variations/generated_resources_map.cc',
 
     # TODO(GYP) Also add these nacl_defines to direct dependents.
     #defines = nacl_defines
 
     # TODO(GYP) remove this when the real webrtc target is used below.
     configs += [ "//content:webrtc_stub_config" ]
 
     deps += [
       "//cc",
+      "//chrome/browser/extensions",
       "//chrome/browser/performance_monitor",
       "//chrome/browser/sync_file_system:sync_file_system_proto",
       "//chrome/browser/sync_file_system/drive_backend:sync_file_system_drive_proto",
       "//chrome/common/extensions/api:api",
       "//components/autofill/content/browser",
       "//components/dom_distiller/content",
       "//components/keyed_service/content",
       "//components/translate/content/browser",
       "//components/url_matcher",
       "//components/usb_service",
@@ skipping 16 matching lines @@
       "//ui/gl",
       "//ui/surface",
       "//ui/web_dialogs",
       "//v8",
       "//webkit:resources",
       "//webkit/browser:storage",
       "//webkit/common",
       "//webkit/common:storage",
       # TODO(GYP)
       #"apps",
-      #"browser_extensions",
       #"debugger",
       #"installer_util",
       #"../components/components.gyp:navigation_interception",
       #"../components/components.gyp:password_manager_content_browser",
       #"../components/components.gyp:precache_content",
       #"../components/components.gyp:sessions",
       #"../components/components.gyp:storage_monitor",
       #"../media/cast/cast.gyp:cast_transport",
       #"../media/media.gyp:media",
       ## TODO(tonyg): Remove this dependency (crbug.com/280157).
@@ skipping 466 matching lines @@
 # TODO(GYP) write internal action
 if (false) {  #if (is_chrome_branded) {
   action("chrome_internal_resources_gen") {
     # TODO(GYP)
   }
 } else {
   group("chrome_internal_resources_gen") {
     # Empty placeholder.
   }
 }