Componentize OriginsSeenService & provide iOS factory.

chrome/browser/tab_contents/origins_seen_service_factory.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 "chrome/browser/tab_contents/origins_seen_service_factory.h"
 
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
-OriginsSeenService* OriginsSeenServiceFactory::GetForBrowserContext(
+navigation_metrics::OriginsSeenService*
+OriginsSeenServiceFactory::GetForBrowserContext(
     content::BrowserContext* context) {
-  return static_cast<OriginsSeenService*>(
+  return static_cast<navigation_metrics::OriginsSeenService*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
 OriginsSeenServiceFactory* OriginsSeenServiceFactory::GetInstance() {
   return base::Singleton<OriginsSeenServiceFactory>::get();
 }
 
 // static
 KeyedService* OriginsSeenServiceFactory::BuildInstanceFor(
     content::BrowserContext* context) {
-  return new OriginsSeenService();
+  return new navigation_metrics::OriginsSeenService();
 }
 
 OriginsSeenServiceFactory::OriginsSeenServiceFactory()
     : BrowserContextKeyedServiceFactory(
           "OriginsSeenService",
           BrowserContextDependencyManager::GetInstance()) {}
 
 OriginsSeenServiceFactory::~OriginsSeenServiceFactory() {}
 
 content::BrowserContext* OriginsSeenServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 }
 
 KeyedService* OriginsSeenServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return BuildInstanceFor(context);
 }