Topsites become keyedService based.

chrome/browser/history/top_sites_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/history/top_sites_factory.h"
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/history/top_sites_impl.h"
+#include "chrome/common/chrome_constants.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+// static
+scoped_refptr<history::TopSites> TopSitesFactory::GetForProfile(
+    Profile* profile) {
+  return static_cast<history::TopSites*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true).get());
+}
+
+// static
+scoped_refptr<history::TopSites> TopSitesFactory::GetForProfileIfExists(
+    Profile* profile) {
+  return static_cast<history::TopSites*>(
+      GetInstance()->GetServiceForBrowserContext(profile, false).get());
+}
+
+// static
+TopSitesFactory* TopSitesFactory::GetInstance() {
+  return Singleton<TopSitesFactory>::get();
+}
+
+scoped_refptr<RefcountedKeyedService> TopSitesFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  history::TopSitesImpl* top_sites =
+      new history::TopSitesImpl(static_cast<Profile*>(context));
+  top_sites->Init(context->GetPath().Append(chrome::kTopSitesFilename));
+  return make_scoped_refptr(top_sites);
+}
+
+bool TopSitesFactory::ServiceIsNULLWhileTesting() const {
+  return true;
+}
+
+TopSitesFactory::TopSitesFactory()
+    : RefcountedBrowserContextKeyedServiceFactory(
+          "TopSites",
+          BrowserContextDependencyManager::GetInstance()) {
+}
+
+TopSitesFactory::~TopSitesFactory() {
+}