Fix WebApkInstallService::IsInstallInProgress() crash.

chrome/browser/android/webapk/webapk_install_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/android/webapk/webapk_install_service_factory.h"
 
 #include "chrome/browser/android/webapk/webapk_install_service.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
 WebApkInstallServiceFactory* WebApkInstallServiceFactory::GetInstance() {
   return base::Singleton<WebApkInstallServiceFactory>::get();
 }
 
 // static
 WebApkInstallService* WebApkInstallServiceFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<WebApkInstallService*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 WebApkInstallServiceFactory::WebApkInstallServiceFactory()
     : BrowserContextKeyedServiceFactory(
           "WebApkInstallService",
           BrowserContextDependencyManager::GetInstance()) {}
 
 WebApkInstallServiceFactory::~WebApkInstallServiceFactory() {}
 
 KeyedService* WebApkInstallServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new WebApkInstallService(context);
 }
+
+content::BrowserContext* WebApkInstallServiceFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return chrome::GetBrowserContextRedirectedInIncognito(context);
+}