Some linked_ptr -> unique_ptr conversion in extensions/browser.

extensions/browser/api/storage/local_value_store_cache.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_API_STORAGE_LOCAL_VALUE_STORE_CACHE_H_
 #define EXTENSIONS_BROWSER_API_STORAGE_LOCAL_VALUE_STORE_CACHE_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "extensions/browser/api/storage/settings_storage_quota_enforcer.h"
 #include "extensions/browser/api/storage/value_store_cache.h"
 
 namespace extensions {
 
 class ValueStoreFactory;
 
 // ValueStoreCache for the LOCAL namespace. It owns a backend for apps and
 // another for extensions. Each backend takes care of persistence.
 class LocalValueStoreCache : public ValueStoreCache {
  public:
   explicit LocalValueStoreCache(
       const scoped_refptr<ValueStoreFactory>& factory);
   ~LocalValueStoreCache() override;
 
   // ValueStoreCache implementation:
   void RunWithValueStoreForExtension(
       const StorageCallback& callback,
       scoped_refptr<const Extension> extension) override;
   void DeleteStorageSoon(const std::string& extension_id) override;
 
  private:
-  typedef std::map<std::string, linked_ptr<ValueStore> > StorageMap;
+  using StorageMap = std::map<std::string, std::unique_ptr<ValueStore>>;
 
   ValueStore* GetStorage(const Extension* extension);
 
   // The Factory to use for creating new ValueStores.
   const scoped_refptr<ValueStoreFactory> storage_factory_;
 
   // Quota limits (see SettingsStorageQuotaEnforcer).
   const SettingsStorageQuotaEnforcer::Limits quota_;
 
   // The collection of ValueStores for local storage.
   StorageMap storage_map_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalValueStoreCache);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_STORAGE_LOCAL_VALUE_STORE_CACHE_H_