Fix races in DeviceLocalAccountTest.Extensions*

chrome/browser/chromeos/extensions/device_local_account_external_policy_loader.cc

 // Copyright 2013 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/chromeos/extensions/device_local_account_external_policy_loader.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/prefs/pref_value_map.h"
 #include "base/values.h"
@@ skipping 63 matching lines @@
   DCHECK_EQ(store_, store);
 }
 
 void DeviceLocalAccountExternalPolicyLoader::OnExtensionListsUpdated(
     const base::DictionaryValue* prefs) {
   DCHECK(external_cache_ || prefs->empty());
   prefs_.reset(prefs->DeepCopy());
   LoadFinished();
 }
 
+ExternalCache*
+DeviceLocalAccountExternalPolicyLoader::GetExternalCacheForTesting() {
+  return external_cache_.get();
+}
+
 DeviceLocalAccountExternalPolicyLoader::
     ~DeviceLocalAccountExternalPolicyLoader() {
   DCHECK(!external_cache_);
 }
 
 void DeviceLocalAccountExternalPolicyLoader::UpdateExtensionListFromStore() {
   scoped_ptr<base::DictionaryValue> prefs(new base::DictionaryValue);
   const policy::PolicyMap& policy_map = store_->policy_map();
   extensions::ExtensionInstallForcelistPolicyHandler policy_handler;
   if (policy_handler.CheckPolicySettings(policy_map, NULL)) {
     PrefValueMap pref_value_map;
     policy_handler.ApplyPolicySettings(policy_map, &pref_value_map);
     const base::Value* value = NULL;
     const base::DictionaryValue* dict = NULL;
     if (pref_value_map.GetValue(extensions::pref_names::kInstallForceList,
                                 &value) &&
         value->GetAsDictionary(&dict)) {
       prefs.reset(dict->DeepCopy());
     }
   }
 
   external_cache_->UpdateExtensionsList(prefs.Pass());
 }
 
 }  // namespace chromeos