"up-to-date" should only use hyphens when used as compound modifier of a noun

components/history/core/browser/history_database.h

 // 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.
 
 #ifndef COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_DATABASE_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_DATABASE_H_
 
 #include <stddef.h>
 
 #include "base/compiler_specific.h"
@@ skipping 156 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(AndroidURLsMigrationTest, MigrateToVersion22);
 #endif
   friend class ::HistoryQuickProviderTest;
   friend class ::InMemoryURLIndexTest;
 
   // Overridden from URLDatabase:
   sql::Connection& GetDB() override;
 
   // Migration -----------------------------------------------------------------
 
-  // Makes sure the version is up-to-date, updating if necessary. If the
+  // Makes sure the version is up to date, updating if necessary. If the
   // database is too old to migrate, the user will be notified. Returns
-  // sql::INIT_OK iff  the DB is up-to-date and ready for use.
+  // sql::INIT_OK iff  the DB is up to date and ready for use.
   //
   // This assumes it is called from the init function inside a transaction. It
   // may commit the transaction and start a new one if migration requires it.
   sql::InitStatus EnsureCurrentVersion();
 
 #if !defined(OS_WIN)
   // Converts the time epoch in the database from being 1970-based to being
   // 1601-based which corresponds to the change in Time.internal_value_.
   void MigrateTimeEpoch();
 #endif
 
   // ---------------------------------------------------------------------------
 
   sql::Connection::ErrorCallback error_callback_;
   sql::Connection db_;
   sql::MetaTable meta_table_;
 
   base::Time cached_early_expiration_threshold_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryDatabase);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_DATABASE_H_