Splits the OfflinePageModel into and interface and and implementation class.

chrome/browser/android/offline_pages/offline_page_model_factory.cc

 // Copyright 2015 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/android/offline_pages/offline_page_model_factory.h"
 
 #include <utility>
 
 #include "base/files/file_path.h"
 #include "base/memory/singleton.h"
 #include "base/sequenced_task_runner.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_constants.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/offline_pages/offline_page_metadata_store_sql.h"
-#include "components/offline_pages/offline_page_model.h"
+#include "components/offline_pages/offline_page_model_impl.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace offline_pages {
 
 OfflinePageModelFactory::OfflinePageModelFactory()
     : BrowserContextKeyedServiceFactory(
           "OfflinePageModel",
           BrowserContextDependencyManager::GetInstance()) {
 }
 
@@ skipping 17 matching lines @@
           content::BrowserThread::GetBlockingPool()->GetSequenceToken());
 
   base::FilePath store_path =
       profile->GetPath().Append(chrome::kOfflinePageMetadataDirname);
   std::unique_ptr<OfflinePageMetadataStore> metadata_store(
       new OfflinePageMetadataStoreSQL(background_task_runner, store_path));
 
   base::FilePath archives_dir =
       profile->GetPath().Append(chrome::kOfflinePageArchviesDirname);
 
-  return new OfflinePageModel(std::move(metadata_store), archives_dir,
-                              background_task_runner);
+  return new OfflinePageModelImpl(std::move(metadata_store), archives_dir,
+                                  background_task_runner);
 }
 
 }  // namespace offline_pages