Add a Restore() method to ValueStore and make StorageAPI use it

chrome/browser/extensions/api/storage/weak_unlimited_settings_storage.cc

 // Copyright (c) 2012 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/extensions/api/storage/weak_unlimited_settings_storage.h"
 
 namespace extensions {
 
 WeakUnlimitedSettingsStorage::WeakUnlimitedSettingsStorage(
     ValueStore* delegate)
@@ skipping 46 matching lines @@
 
 ValueStore::WriteResult WeakUnlimitedSettingsStorage::Remove(
     const std::vector<std::string>& keys) {
   return delegate_->Remove(keys);
 }
 
 ValueStore::WriteResult WeakUnlimitedSettingsStorage::Clear() {
   return delegate_->Clear();
 }
 
+bool WeakUnlimitedSettingsStorage::Restore() { return delegate_->Restore(); }
+
+bool WeakUnlimitedSettingsStorage::RestoreKey(const std::string& key) {
+  return delegate_->RestoreKey(key);
+}
+
 }  // namespace extensions