Update GN build files for new prefs location.

components/proximity_auth/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("//testing/test.gni")
 
 source_set("proximity_auth") {
   sources = [
     "authenticator.h",
     "bluetooth_connection.cc",
@@ skipping 53 matching lines @@
     "throttled_bluetooth_connection_finder.cc",
     "throttled_bluetooth_connection_finder.h",
     "unlock_manager.cc",
     "unlock_manager.h",
     "wire_message.cc",
     "wire_message.h",
   ]
 
   deps = [
     "//base",
-    "//base:prefs",
+    "//components/prefs",
     "//components/proximity_auth/ble",
     "//components/proximity_auth/cryptauth",
     "//components/proximity_auth/logging",
     "//components/signin/core/account_id:account_id",
     "//device/bluetooth",
     "//net",
   ]
 
   # TODO(https://crbug.com/562683): This whitelists a circular include
   # dependency between this target and the following targets which should not
@@ skipping 57 matching lines @@
     "unlock_manager_unittest.cc",
     "wire_message_unittest.cc",
   ]
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     ":proximity_auth",
     ":test_support",
     "//base",
-    "//base:prefs_test_support",
     "//base/test:test_support",
+    "//components/prefs:test_support",
     "//components/proximity_auth/ble:unit_tests",
     "//components/proximity_auth/cryptauth:test_support",
     "//components/proximity_auth/cryptauth:unit_tests",
     "//components/proximity_auth/logging",
     "//components/proximity_auth/logging:unit_tests",
     "//device/bluetooth:mocks",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (is_chromeos) {
     deps += [ "//chromeos" ]
   }
 }
 
 # Note: This is a convenience target for ease of rapid iteration during
 # development. It is not executed on any try or build bots.
 if (!is_chromeos) {
   test("proximity_auth_unittests") {
     sources = [
       "run_all_unittests.cc",
     ]
     deps = [
       ":unit_tests",
       "//base",
       "//base/test:test_support",
     ]
   }
 }