Update GN build files for new prefs location.

rlz/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.
 
 # Note that this build file assumes rlz_use_chrome_net which is a condition in
 # the GYP file, but is always true for Chrome builds.
 
 import("//testing/test.gni")
 
 config("rlz_config") {
@@ skipping 95 matching lines @@
     "win/lib/machine_deal_test.cc",
   ]
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     ":rlz_lib",
     ":test_support",
     "//base",
-    "//base:prefs",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/zlib",
   ]
 }
 
 executable("rlz_id") {
   sources = [
     "examples/rlz_id.cc",
@@ skipping 10 matching lines @@
       "win/dll/dll_main.cc",
       "win/dll/exports.cc",
     ]
     deps = [
       ":rlz_lib",
       "//build/config/sanitizers:deps",
       "//third_party/zlib",
     ]
   }
 }