[Sync] Replacing NULL with nullptr/null throughout sync code.

chrome/browser/sync/test/integration/typed_urls_helper.cc

 // Copyright (c) 2012 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 "chrome/browser/sync/test/integration/typed_urls_helper.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 146 matching lines @@
 }
 
 // Creates a URLRow in the specified HistoryService with the passed transition
 // type.
 void AddToHistory(history::HistoryService* service,
                   const GURL& url,
                   ui::PageTransition transition,
                   history::VisitSource source,
                   const base::Time& timestamp) {
   service->AddPage(url, timestamp,
-                   NULL,    // scope
-                   1234,    // nav_entry_id
-                   GURL(),  // referrer
+                   nullptr,  // scope
+                   1234,     // nav_entry_id
+                   GURL(),   // referrer
                    history::RedirectList(), transition, source, false);
 }
 
 history::URLRows GetTypedUrlsFromHistoryService(
     history::HistoryService* service) {
   base::CancelableTaskTracker tracker;
   history::URLRows rows;
   base::WaitableEvent wait_event(
       base::WaitableEvent::ResetPolicy::MANUAL,
       base::WaitableEvent::InitialState::NOT_SIGNALED);
@@ skipping 39 matching lines @@
   base::CancelableTaskTracker tracker;
   base::WaitableEvent wait_event(
       base::WaitableEvent::ResetPolicy::MANUAL,
       base::WaitableEvent::InitialState::NOT_SIGNALED);
   service->ScheduleDBTask(std::unique_ptr<history::HistoryDBTask>(
                               new RemoveVisitsTask(visits, &wait_event)),
                           &tracker);
   wait_event.Wait();
 }
 
-static base::Time* timestamp = NULL;
+static base::Time* timestamp = nullptr;
 
 }  // namespace
 
 namespace typed_urls_helper {
 
 history::URLRows GetTypedUrlsFromClient(int index) {
   history::HistoryService* service =
       HistoryServiceFactory::GetForProfileWithoutCreating(
           test()->GetProfile(index));
   return GetTypedUrlsFromHistoryService(service);
@@ skipping 184 matching lines @@
     : MultiClientStatusChangeChecker(
         sync_datatype_helper::test()->GetSyncServices()) {}
 
 bool ProfilesHaveSameURLsChecker::IsExitConditionSatisfied() {
   return typed_urls_helper::CheckAllProfilesHaveSameURLs();
 }
 
 std::string ProfilesHaveSameURLsChecker::GetDebugMessage() const {
   return "Waiting for matching typed urls profiles";
 }