[sync] SYNC_AUTH_ERROR in logs when running sync_integration_tests

components/sync/engine_impl/net/server_connection_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/sync/engine_impl/net/server_connection_manager.h"
 
 #include <errno.h>
 
 #include <ostream>
 #include <vector>
@@ skipping 248 matching lines @@
                                                const string& auth_token) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // TODO(pavely): crbug.com/273096. Check for "credentials_lost" is added as
   // workaround for M29 blocker to avoid sending RPC to sync with known invalid
   // token but instead to trigger refreshing token in ProfileSyncService. Need
   // to clean it.
   if (auth_token.empty() || auth_token == "credentials_lost") {
     params->response.server_status = HttpResponse::SYNC_AUTH_ERROR;
     // Print a log to distinguish this "known failure" from others.
-    LOG(WARNING) << "ServerConnectionManager forcing SYNC_AUTH_ERROR";
+    DVLOG(1) << "ServerConnectionManager forcing SYNC_AUTH_ERROR due to missing"
+                " auth token";
     return false;
   }
 
   // When our connection object falls out of scope, it clears itself from
   // active_connection_.
   ScopedConnectionHelper post(this, MakeActiveConnection());
   if (!post.get()) {
     params->response.server_status = HttpResponse::CONNECTION_UNAVAILABLE;
     return false;
   }
@@ skipping 47 matching lines @@
 
 std::ostream& operator<<(std::ostream& s, const struct HttpResponse& hr) {
   s << " Response Code (bogus on error): " << hr.response_code;
   s << " Content-Length (bogus on error): " << hr.content_length;
   s << " Server Status: "
     << HttpResponse::GetServerConnectionCodeString(hr.server_status);
   return s;
 }
 
 }  // namespace syncer