[Sync] Remove NOTREACHED that causes flakes in Android tests.

components/browser_sync/browser/profile_sync_service.cc

Index: components/browser_sync/browser/profile_sync_service.cc
diff --git a/components/browser_sync/browser/profile_sync_service.cc b/components/browser_sync/browser/profile_sync_service.cc
index a41b846d748d38185b63c7bdc93751727ff758ed..40ea1d90fd89b3f8d5b5b3a970e3ce3c02217700 100644
--- a/components/browser_sync/browser/profile_sync_service.cc
+++ b/components/browser_sync/browser/profile_sync_service.cc
@@ -1154,9 +1154,7 @@ void ProfileSyncService::OnConnectionStatusChange(
       // possible that sync flips between OK and auth error states rapidly,
       // thus hammers token server. To be safe, only reset backoff delay when
       // no scheduled request.
-      if (request_access_token_retry_timer_.IsRunning()) {
-        NOTREACHED();
-      } else {
+      if (!request_access_token_retry_timer_.IsRunning()) {
         request_access_token_backoff_.Reset();
       }
     }