Convert RLZ to a buildflag header

ios/chrome/browser/search_engines/ui_thread_search_terms_data.cc

 // Copyright 2015 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.
 
 #include "ios/chrome/browser/search_engines/ui_thread_search_terms_data.h"
 
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "components/google/core/browser/google_url_tracker.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/omnibox/browser/omnibox_field_trial.h"
 #include "components/search/search.h"
 #include "components/version_info/version_info.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #include "ios/chrome/browser/google/google_brand.h"
 #include "ios/chrome/browser/google/google_url_tracker_factory.h"
 #include "ios/chrome/common/channel_info.h"
 #include "ios/web/public/web_thread.h"
 #include "net/base/escape.h"
+#include "rlz/features/features.h"
 #include "url/gurl.h"
 
-#if defined(ENABLE_RLZ)
+#if BUILDFLAG(ENABLE_RLZ)
 #include "components/rlz/rlz_tracker.h"  // nogncheck
 #endif
 
 namespace ios {
 
 UIThreadSearchTermsData::UIThreadSearchTermsData(
     ios::ChromeBrowserState* browser_state)
     : browser_state_(browser_state) {
   DCHECK(!web::WebThread::IsThreadInitialized(web::WebThread::UI) ||
          web::WebThread::CurrentlyOn(web::WebThread::UI));
@@ skipping 19 matching lines @@
 std::string UIThreadSearchTermsData::GetApplicationLocale() const {
   DCHECK(thread_checker_.CalledOnValidThread());
   return GetApplicationContext()->GetApplicationLocale();
 }
 
 base::string16 UIThreadSearchTermsData::GetRlzParameterValue(
     bool from_app_list) const {
   DCHECK(!from_app_list);
   DCHECK(thread_checker_.CalledOnValidThread());
   base::string16 rlz_string;
-#if defined(ENABLE_RLZ)
+#if BUILDFLAG(ENABLE_RLZ)
   // For organic brandcode do not use rlz at all.
   std::string brand;
   if (ios::google_brand::GetBrand(&brand) &&
       !ios::google_brand::IsOrganic(brand)) {
     // This call will may return false until the value has been cached. This
     // normally would mean that a few omnibox searches might not send the RLZ
     // data but this is not really a problem (as the value will eventually be
     // set and cached).
     rlz::RLZTracker::GetAccessPointRlz(rlz::RLZTracker::ChromeOmnibox(),
                                        &rlz_string);
@@ skipping 35 matching lines @@
   if (version_info::IsOfficialBuild())
     version += " (Official)";
   version += " " + version_info::GetOSType();
   std::string modifier(GetChannelString());
   if (!modifier.empty())
     version += " " + modifier;
   return version;
 }
 
 }  // namespace ios