Fix races in DeviceLocalAccountTest.Extensions*

chrome/browser/chromeos/extensions/device_local_account_external_policy_loader.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_DEVICE_LOCAL_ACCOUNT_EXTERNAL_POLICY_LOADER_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_DEVICE_LOCAL_ACCOUNT_EXTERNAL_POLICY_LOADER_H_
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
@@ skipping 40 matching lines @@
   virtual void StartLoading() OVERRIDE;
 
   // policy::CloudPolicyStore::Observer:
   virtual void OnStoreLoaded(policy::CloudPolicyStore* store) OVERRIDE;
   virtual void OnStoreError(policy::CloudPolicyStore* store) OVERRIDE;
 
   // ExternalCache::Delegate:
   virtual void OnExtensionListsUpdated(
       const base::DictionaryValue* prefs) OVERRIDE;
 
+  ExternalCache* GetExternalCacheForTesting();
+
  private:
   // If the cache was started, it must be stopped before |this| is destroyed.
   virtual ~DeviceLocalAccountExternalPolicyLoader();
 
   // Pass the current list of force-installed extensions from the |store_| to
   // the |external_cache_|.
   void UpdateExtensionListFromStore();
 
   policy::CloudPolicyStore* store_;
   const base::FilePath cache_dir_;
   scoped_ptr<ExternalCache> external_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceLocalAccountExternalPolicyLoader);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_DEVICE_LOCAL_ACCOUNT_EXTERNAL_POLICY_LOADER_H_