[SyncFS] Add browser_tests to test authentication state of SyncFS

chrome/browser/sync_file_system/sync_file_system_service.cc

Index: chrome/browser/sync_file_system/sync_file_system_service.cc
diff --git a/chrome/browser/sync_file_system/sync_file_system_service.cc b/chrome/browser/sync_file_system/sync_file_system_service.cc
index 3b1bfa88739452e66673d8cf1c8dd54309eb815e..1acf14bd5ac9150a2102aabc7095143989b2fceb 100644
--- a/chrome/browser/sync_file_system/sync_file_system_service.cc
+++ b/chrome/browser/sync_file_system/sync_file_system_service.cc
@@ -396,8 +396,7 @@ void SyncFileSystemService::CheckIfIdle() {
 
   for (size_t i = 0; i < remote_sync_runners_.size(); ++i) {
     SyncServiceState service_state = remote_sync_runners_[i]->GetServiceState();
-    if (service_state != SYNC_SERVICE_RUNNING &&
-        service_state != SYNC_SERVICE_TEMPORARY_UNAVAILABLE)
+    if (service_state != SYNC_SERVICE_RUNNING)
       continue;
 
     if (remote_sync_runners_[i]->pending_changes())
@@ -406,8 +405,7 @@ void SyncFileSystemService::CheckIfIdle() {
 
   for (size_t i = 0; i < local_sync_runners_.size(); ++i) {
     SyncServiceState service_state = local_sync_runners_[i]->GetServiceState();
-    if (service_state != SYNC_SERVICE_RUNNING &&
-        service_state != SYNC_SERVICE_TEMPORARY_UNAVAILABLE)
+    if (service_state != SYNC_SERVICE_RUNNING)
       continue;
 
     if (local_sync_runners_[i]->pending_changes())