Make the authentication service remember selected usernames.

services/authenticating_url_loader/authenticating_url_loader_factory_impl.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 "services/authenticating_url_loader/authenticating_url_loader_factory_impl.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "mojo/public/cpp/application/application_impl.h"
@@ skipping 35 matching lines @@
       // Clear the cached token in case the request is due to that token being
       // stale.
       authentication_service_->ClearOAuth2Token((*cached_tokens_)[origin]);
       cached_tokens_->erase(origin);
     }
     if (cached_accounts_.find(origin) != cached_accounts_.end()) {
       OnAccountSelected(origin, cached_accounts_[origin], mojo::String());
       return;
     }
     authentication_service_->SelectAccount(
-        base::Bind(&AuthenticatingURLLoaderFactoryImpl::OnAccountSelected,
-                   base::Unretained(this), origin));
+        true, base::Bind(&AuthenticatingURLLoaderFactoryImpl::OnAccountSelected,
+                         base::Unretained(this), origin));
   }
   pendings_retrieve_token_[origin].push_back(callback);
 }
 
 void AuthenticatingURLLoaderFactoryImpl::OnURLLoaderError(
     AuthenticatingURLLoaderImpl* url_loader) {
   auto it = std::find_if(
       url_loaders_.begin(), url_loaders_.end(),
       [url_loader](const std::unique_ptr<AuthenticatingURLLoaderImpl>& p) {
         return p.get() == url_loader;
@@ skipping 61 matching lines @@
 void AuthenticatingURLLoaderFactoryImpl::ExecuteCallbacks(
     const GURL& origin,
     const std::string& result) {
   for (auto& callback : pendings_retrieve_token_[origin]) {
     callback.Run(result);
   }
   pendings_retrieve_token_.erase(origin);
 }
 
 }  // namespace mojo