Delay fetching account info until OnRefreshTokensLoaded().

chrome/browser/signin/mutable_profile_oauth2_token_service_delegate.cc

 // Copyright 2015 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 "chrome/browser/signin/mutable_profile_oauth2_token_service_delegate.h"
 
 #include "base/profiler/scoped_tracker.h"
 #include "components/signin/core/browser/signin_client.h"
 #include "components/signin/core/browser/signin_metrics.h"
 #include "components/signin/core/browser/webdata/token_web_data.h"
@@ skipping 220 matching lines @@
   return account_ids;
 }
 
 net::URLRequestContextGetter*
 MutableProfileOAuth2TokenServiceDelegate::GetRequestContext() const {
   return client_->GetURLRequestContext();
 }
 
 void MutableProfileOAuth2TokenServiceDelegate::LoadCredentials(
     const std::string& primary_account_id) {
-  DCHECK(!primary_account_id.empty());
+  if (primary_account_id.empty()) {
+    FireRefreshTokensLoaded();
+    return;
+  }
   ValidateAccountId(primary_account_id);
   DCHECK(loading_primary_account_id_.empty());
   DCHECK_EQ(0, web_data_service_request_);
 
   refresh_tokens_.clear();
 
   // If the account_id is an email address, then canonicalize it.  This
   // is to support legacy account_ids, and will not be needed after
   // switching to gaia-ids.
   if (primary_account_id.find('@') != std::string::npos) {
@@ skipping 257 matching lines @@
   CancelWebTokenFetch();
   refresh_tokens_.clear();
 }
 
 void MutableProfileOAuth2TokenServiceDelegate::OnNetworkChanged(
     net::NetworkChangeNotifier::ConnectionType type) {
   // If our network has changed, reset the backoff timer so that errors caused
   // by a previous lack of network connectivity don't prevent new requests.
   backoff_entry_.Reset();
 }