Move all components/offline_pages/ files into component/offline_pages/core

components/offline_pages/offline_page_model.cc

-// Copyright 2016 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/offline_pages/offline_page_model.h"
-
-#include "url/gurl.h"
-
-namespace offline_pages {
-
-OfflinePageModel::SavePageParams::SavePageParams()
-    : proposed_offline_id(OfflinePageModel::kInvalidOfflineId) {
-}
-
-OfflinePageModel::SavePageParams::SavePageParams(const SavePageParams& other) {
-  url = other.url;
-  client_id = other.client_id;
-  proposed_offline_id = other.proposed_offline_id;
-  original_url = other.original_url;
-}
-
-// static
-bool OfflinePageModel::CanSaveURL(const GURL& url) {
-  return url.is_valid() && url.SchemeIsHTTPOrHTTPS();
-}
-
-OfflinePageModel::OfflinePageModel() {}
-
-OfflinePageModel::~OfflinePageModel() {}
-
-}  // namespace offline_pages