[Sync] Replacing NULL with nullptr in code and null in comments for components/sync/

components/sync/engine_impl/sync_manager_impl.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 "components/sync/engine_impl/sync_manager_impl.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 66 matching lines @@
     case CONFIGURE_REASON_UNKNOWN:
       NOTREACHED();
   }
   return GetUpdatesCallerInfo::UNKNOWN;
 }
 
 }  // namespace
 
 SyncManagerImpl::SyncManagerImpl(const std::string& name)
     : name_(name),
-      change_delegate_(NULL),
+      change_delegate_(nullptr),
       initialized_(false),
       observing_network_connectivity_changes_(false),
       weak_ptr_factory_(this) {
   // Pre-fill |notification_info_map_|.
   for (int i = FIRST_REAL_MODEL_TYPE; i < MODEL_TYPE_COUNT; ++i) {
     notification_info_map_.insert(
         std::make_pair(ModelTypeFromInt(i), NotificationInfo()));
   }
 }
 
@@ skipping 420 matching lines @@
   if (sync_encryption_handler_) {
     sync_encryption_handler_->RemoveObserver(&debug_info_event_listener_);
     sync_encryption_handler_->RemoveObserver(this);
   }
 
   SetJsEventHandler(WeakHandle<JsEventHandler>());
   RemoveObserver(&js_sync_manager_observer_);
 
   RemoveObserver(&debug_info_event_listener_);
 
-  // |connection_manager_| may end up being NULL here in tests (in synchronous
+  // |connection_manager_| may end up being null here in tests (in synchronous
   // initialization mode).
   //
   // TODO(akalin): Fix this behavior.
   if (connection_manager_)
     connection_manager_->RemoveListener(this);
   connection_manager_.reset();
 
   net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
   net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
   observing_network_connectivity_changes_ = false;
 
   if (initialized_ && directory()) {
     directory()->SaveChanges();
   }
 
   share_.directory.reset();
 
-  change_delegate_ = NULL;
+  change_delegate_ = nullptr;
 
   initialized_ = false;
 
   // We reset these here, since only now we know they will not be
   // accessed from other threads (since we shut down everything).
   change_observer_.Reset();
   weak_handle_this_.Reset();
 }
 
 void SyncManagerImpl::OnIPAddressChanged() {
@@ skipping 438 matching lines @@
 }
 
 void SyncManagerImpl::OnCookieJarChanged(bool account_mismatch,
                                          bool empty_jar) {
   DCHECK(thread_checker_.CalledOnValidThread());
   cycle_context_->set_cookie_jar_mismatch(account_mismatch);
   cycle_context_->set_cookie_jar_empty(empty_jar);
 }
 
 }  // namespace syncer