Add browser tests for clearing sync registrations with site data

content/browser/background_sync/background_sync_network_observer.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 "content/browser/background_sync/background_sync_network_observer.h"
 
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 47 matching lines @@
 
 void BackgroundSyncNetworkObserver::OnNetworkChanged(
     net::NetworkChangeNotifier::ConnectionType connection_type) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   if (ignore_network_change_notifier_)
     return;
   NotifyManagerIfNetworkChanged(connection_type);
 }
 
+void BackgroundSyncNetworkObserver::NotifyManagerIfNetworkChangedForTesting(
+    net::NetworkChangeNotifier::ConnectionType connection_type) {
+  NotifyManagerIfNetworkChanged(connection_type);
+}
+
 void BackgroundSyncNetworkObserver::NotifyManagerIfNetworkChanged(
     net::NetworkChangeNotifier::ConnectionType connection_type) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (connection_type == connection_type_)
     return;
 
   connection_type_ = connection_type;
   NotifyNetworkChanged();
 }
 
 void BackgroundSyncNetworkObserver::NotifyNetworkChanged() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                 network_changed_callback_);
 }
 
 }  // namespace content