Split HistoryClient in two objects

components/history/core/browser/history_client.cc

-// 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.
-
-#include "components/history/core/browser/history_client.h"
-
-namespace history {
-
-HistoryClient::HistoryClient() {
-}
-
-HistoryClient::~HistoryClient() {
-}
-
-void HistoryClient::Shutdown() {
-}
-
-void HistoryClient::BlockUntilBookmarksLoaded() {
-}
-
-bool HistoryClient::IsBookmarked(const GURL& url) {
-  return false;
-}
-
-void HistoryClient::GetBookmarks(std::vector<URLAndTitle>* bookmarks) {
-}
-
-bool HistoryClient::CanAddURL(const GURL& url) {
-  return true;
-}
-
-void HistoryClient::NotifyProfileError(sql::InitStatus init_status) {
-}
-
-bool HistoryClient::ShouldReportDatabaseError() {
-  return false;
-}
-
-void HistoryClient::OnHistoryBackendInitialized(
-    HistoryBackend* history_backend,
-    HistoryDatabase* history_database,
-    ThumbnailDatabase* thumbnail_database,
-    const base::FilePath& history_dir) {
-}
-
-void HistoryClient::OnHistoryBackendDestroyed(
-    HistoryBackend* history_backend,
-    const base::FilePath& history_dir) {
-}
-
-}  // namespace history