cros: Only preload the lock screen; do not reuse it.

chrome/browser/chromeos/login/ui/shared_web_view_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/chromeos/login/ui/shared_web_view_factory.h"
-
-#include "chrome/browser/chromeos/login/ui/shared_web_view.h"
-#include "chrome/browser/chromeos/profiles/profile_helper.h"
-#include "chrome/browser/profiles/incognito_helpers.h"
-#include "chrome/browser/profiles/profile.h"
-#include "components/keyed_service/content/browser_context_dependency_manager.h"
-
-namespace chromeos {
-
-// static
-SharedWebView* SharedWebViewFactory::GetForProfile(Profile* profile) {
-  auto result = static_cast<SharedWebView*>(
-      GetInstance()->GetServiceForBrowserContext(profile, true));
-  return result;
-}
-
-// static
-SharedWebViewFactory* SharedWebViewFactory::GetInstance() {
-  return base::Singleton<SharedWebViewFactory>::get();
-}
-
-SharedWebViewFactory::SharedWebViewFactory()
-    : BrowserContextKeyedServiceFactory(
-          "SharedWebViewFactory",
-          BrowserContextDependencyManager::GetInstance()) {}
-
-SharedWebViewFactory::~SharedWebViewFactory() {}
-
-content::BrowserContext* SharedWebViewFactory::GetBrowserContextToUse(
-    content::BrowserContext* context) const {
-  // Make sure that only the SigninProfile is using a shared webview.
-  if (Profile::FromBrowserContext(context) != ProfileHelper::GetSigninProfile())
-    return nullptr;
-
-  return context;
-}
-
-KeyedService* SharedWebViewFactory::BuildServiceInstanceFor(
-    content::BrowserContext* context) const {
-  return new SharedWebView(Profile::FromBrowserContext(context));
-}
-
-}  // namespace chromeos