Componentize HistoryDatabase

chrome/browser/history/expire_history_backend.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/history/expire_history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <limits>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
-#include "chrome/browser/history/history_database.h"
 #include "components/history/core/browser/history_backend_notifier.h"
 #include "components/history/core/browser/history_client.h"
+#include "components/history/core/browser/history_database.h"
 #include "components/history/core/browser/thumbnail_database.h"
 
 namespace history {
 
 // Helpers --------------------------------------------------------------------
 
 namespace {
 
 // The number of days by which the expiration threshold is advanced for items
 // that we want to expire early, such as those of AUTO_SUBFRAME transition type.
@@ skipping 476 matching lines @@
 HistoryClient* ExpireHistoryBackend::GetHistoryClient() {
   // We use the history client to determine if a URL is bookmarked. The data is
   // loaded on a separate thread and may not be done by the time we get here.
   // We therefore block until the bookmarks have finished loading.
   if (history_client_)
     history_client_->BlockUntilBookmarksLoaded();
   return history_client_;
 }
 
 }  // namespace history