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

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

Index: chrome/browser/extensions/api/storage/settings_sync_unittest.cc
diff --git a/chrome/browser/extensions/api/storage/settings_sync_unittest.cc b/chrome/browser/extensions/api/storage/settings_sync_unittest.cc
index c8822d1a9f2bdd26bb203d4ebe171805c5148cdc..afd33baa503a9f2fe35967c1b3820eef649a19b5 100644
--- a/chrome/browser/extensions/api/storage/settings_sync_unittest.cc
+++ b/chrome/browser/extensions/api/storage/settings_sync_unittest.cc
@@ -176,12 +176,6 @@
     return new_storage;
   }
 
-  // Testing value stores don't actually create a real database. Don't delete
-  // any files.
-  virtual void DeleteDatabaseIfExists(
-      const base::FilePath& base_path,
-      const std::string& extension_id) OVERRIDE {}
-
  private:
   // SettingsStorageFactory is refcounted.
   virtual ~TestingValueStoreFactory() {}