Convert RLZ to a buildflag header

chrome/test/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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 import("//chrome/chrome_repack_locales.gni")
 import("//chrome/test/base/js2gtest.gni")
 import("//components/os_crypt/features.gni")
 import("//components/spellcheck/spellcheck_build_features.gni")
 import("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//remoting/remoting_enable.gni")
+import("//rlz/features/features.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 import("//v8/gni/v8.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 # This target exists to reference other test executables to bring these files
@@ skipping 1192 matching lines @@
     ":browser_tests_runner",
     ":repack_pseudo_locales",
     ":test_support",
     "//base",
     "//components/spellcheck:build_features",
     "//components/sync:test_support_model",
     "//extensions/features",
     "//media:media_features",
     "//ppapi/features",
     "//printing/features",
+    "//rlz/features",
     "//third_party/WebKit/public:features",
   ]
 
   data_deps = [
     "//testing/buildbot/filters:browser_tests_filters",
   ]
 
   data = []
 
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
@@ skipping 3877 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }