Update GN build files for new prefs location.

extensions/shell/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("//extensions/shell/app_shell.gni")
 
 # Technically, this directory should not depend on files from src/chrome, but
 # that's where the VERSION file is. This  should probably all be moved to
 # src/build.
 import("//chrome/version.gni")
@@ skipping 12 matching lines @@
 
 source_set("app_shell_lib") {
   # TODO(jamescook): investigate and get rid of test dependencies. This library
   # is testonly because it depends on testonly libraries, namely
   # //content/shell:content_shell_lib. See http://crbug.com/438283
   testonly = true
   deps = [
     ":resources",
     ":version_header",
     "//base",
-    "//base:prefs",
     "//components/devtools_discovery",
     "//components/devtools_http_handler",
     "//components/guest_view/browser",
     "//components/guest_view/common",
     "//components/guest_view/renderer",
     "//components/pref_registry",
+    "//components/prefs",
     "//components/update_client",
     "//components/user_prefs",
     "//components/web_cache/renderer",
     "//content",
     "//content/shell:content_shell_lib",
     "//device/core",
     "//device/hid",
     "//extensions:extensions_resources",
     "//extensions:shell_and_test_pak",
     "//extensions/browser",
@@ skipping 177 matching lines @@
     testonly = true
     sources = [
       "app/shell_main_mac.cc",
       "app/shell_main_mac.h",
     ]
     deps = [
       ":app_shell_lib",
     ]
   }
 }