[sync] WebContentsObserver based sessions notifications

components/browser_sync/profile_sync_service.cc

Index: components/browser_sync/profile_sync_service.cc
diff --git a/components/browser_sync/profile_sync_service.cc b/components/browser_sync/profile_sync_service.cc
index ed837f1b31b2ecfa7f70739d6a4f4de247cb9e3a..1b982e58d0494367361b83bfd8b27a377dc99330 100644
--- a/components/browser_sync/profile_sync_service.cc
+++ b/components/browser_sync/profile_sync_service.cc
@@ -225,8 +225,8 @@ void ProfileSyncService::Initialize() {
       base::Bind(&ProfileSyncService::CanEngineStart, base::Unretained(this)),
       base::Bind(&ProfileSyncService::StartUpSlowEngineComponents,
                  weak_factory_.GetWeakPtr()));
-  std::unique_ptr<sync_sessions::LocalSessionEventRouter> router(
-      sync_client_->GetSyncSessionsClient()->GetLocalSessionEventRouter());
+  sync_sessions::LocalSessionEventRouter* router =
+      sync_client_->GetSyncSessionsClient()->GetLocalSessionEventRouter();
   local_device_ = sync_client_->GetSyncApiComponentFactory()
                       ->CreateLocalDeviceInfoProvider();
   sync_stopped_reporter_ = base::MakeUnique<syncer::SyncStoppedReporter>(