Update GN build files for new prefs location.

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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 import("//media/media_options.gni")
@@ skipping 1112 matching lines @@
     "sync/profile_sync_test_util.h",
   ]
 
   configs += [ "//build/config:precompiled_headers" ]
 
   public_deps = [
     ":browser",
     "//chrome/browser/ui:test_support",
   ]
   deps = [
-    "//base:prefs_test_support",
     "//chrome/app/theme:theme_resources",
     "//chrome/browser",
     "//chrome/common",
     "//chrome/common/safe_browsing:proto",
     "//components/browser_sync/browser:test_support",
     "//components/invalidation/impl",
     "//components/invalidation/impl:test_support",
     "//components/password_manager/core/browser:test_support",
+    "//components/prefs:test_support",
     "//components/search_engines:test_support",
     "//components/syncable_prefs:test_support",
     "//components/user_prefs/tracked:user_prefs_tracked_test_support",
     "//content/test:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/gfx",
   ]
@@ skipping 177 matching lines @@
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
       "//components/google/core/browser",
       "//components/omnibox/browser",
       "//components/rlz",
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }