Prevent tabs sync during browser shutdown.

chrome/browser/sync/sessions/notification_service_sessions_router.cc

Index: chrome/browser/sync/sessions/notification_service_sessions_router.cc
diff --git a/chrome/browser/sync/sessions/notification_service_sessions_router.cc b/chrome/browser/sync/sessions/notification_service_sessions_router.cc
index 9bb3d5c8e7d283a9d8c23b16a532c876647fbe88..43dac6517773d8ec76e7a2cf02adecf619156825 100644
--- a/chrome/browser/sync/sessions/notification_service_sessions_router.cc
+++ b/chrome/browser/sync/sessions/notification_service_sessions_router.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/glue/sync_start_util.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/sync/browser_synced_window_delegates_getter.h"
 #include "chrome/browser/ui/sync/tab_contents_synced_tab_delegate.h"
 #include "chrome/common/features.h"
@@ -77,6 +78,14 @@ NotificationServiceSessionsRouter::NotificationServiceSessionsRouter(
       content::NotificationService::AllSources());
   registrar_.Add(this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
       content::NotificationService::AllSources());
+  registrar_.Add(this, chrome::NOTIFICATION_CLOSE_ALL_BROWSERS_REQUEST,
+                 content::NotificationService::AllBrowserContextsAndSources());
+  registrar_.Add(this, chrome::NOTIFICATION_BROWSER_CLOSE_CANCELLED,
+                 content::NotificationService::AllBrowserContextsAndSources());
+  registrar_.Add(this, chrome::NOTIFICATION_BROWSER_CLOSING,
+                 content::NotificationService::AllSources());
+  registrar_.Add(this, chrome::NOTIFICATION_BROWSER_OPENED,
+                 content::NotificationService::AllSources());
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   registrar_.Add(this,
       chrome::NOTIFICATION_TAB_CONTENTS_APPLICATION_EXTENSION_CHANGED,
@@ -129,6 +138,28 @@ void NotificationServiceSessionsRouter::Observe(
         return;
       break;
     }
+    case chrome::NOTIFICATION_CLOSE_ALL_BROWSERS_REQUEST: {
+      if (handler_)
+        handler_->SetAllBrowsersClosing(true);
+      break;
+    }
+#if !defined(OS_IOS)
+    case chrome::NOTIFICATION_BROWSER_CLOSING: {
+      Browser* browser = content::Source<Browser>(source).ptr();
+      if (!browser || browser->profile() != profile_)
+        return;
+      if (handler_ && chrome::GetBrowserCount(profile_) == 1U) {
+        handler_->SetAllBrowsersClosing(true);
+      }
+      break;
+    }
+#endif  // !defined(OS_IOS)
+    case chrome::NOTIFICATION_BROWSER_OPENED:
+    case chrome::NOTIFICATION_BROWSER_CLOSE_CANCELLED: {
+      if (handler_)
+        handler_->SetAllBrowsersClosing(false);
+      break;
+    }
     // Source<NavigationController>.
     case content::NOTIFICATION_NAV_LIST_PRUNED:
     case content::NOTIFICATION_NAV_ENTRY_CHANGED: