[Sync] Restore previous session if no tabbed windows present

ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm

Index: ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm
diff --git a/ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm b/ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm
index 8e7f12ffdb07a1e3b4c2c75acce667845967228f..e954fb9cd2462e48819a3eee2ced3994db11abd1 100644
--- a/ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm
+++ b/ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm
@@ -9,6 +9,7 @@
 #include "components/sync_sessions/sync_sessions_client.h"
 #include "components/sync_sessions/synced_window_delegate.h"
 #include "components/sync_sessions/synced_window_delegates_getter.h"
+#include "components/sync_sessions/tab_node_pool.h"
 #include "ios/chrome/browser/sessions/ios_chrome_session_tab_helper.h"
 #include "ios/web/public/favicon_status.h"
 #include "ios/web/public/navigation_item.h"
@@ -36,7 +37,8 @@ NavigationItem* GetPossiblyPendingItemAtIndex(web::WebState* web_state, int i) {
 }  // namespace
 
 IOSChromeSyncedTabDelegate::IOSChromeSyncedTabDelegate(web::WebState* web_state)
-    : web_state_(web_state), sync_session_id_(0) {}
+    : web_state_(web_state),
+      sync_session_id_(sync_sessions::TabNodePool::kInvalidTabNodeID) {}
 
 IOSChromeSyncedTabDelegate::~IOSChromeSyncedTabDelegate() {}