Allow the PrinterDetector to be constructed with a delegated profile.

chrome/browser/chromeos/printer_detector/printer_detector_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/chromeos/printer_detector/printer_detector_factory.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/chromeos/printer_detector/printer_detector.h"
 #include "chrome/browser/chromeos/printing/printers_manager_factory.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "extensions/browser/extensions_browser_client.h"
 
 namespace chromeos {
 
 namespace {
 
 static base::LazyInstance<PrinterDetectorFactory>::DestructorAtExit g_factory =
@@ skipping 16 matching lines @@
           "PrinterDetectorFactory",
           BrowserContextDependencyManager::GetInstance()) {
   DependsOn(
       extensions::ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
   DependsOn(PrintersManagerFactory::GetInstance());
 }
 
 PrinterDetectorFactory::~PrinterDetectorFactory() {
 }
 
+content::BrowserContext* PrinterDetectorFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return chrome::GetBrowserContextRedirectedInIncognito(context);
+}
+
 KeyedService* PrinterDetectorFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           ::switches::kDisableNativeCups)) {
     return PrinterDetector::CreateLegacy(Profile::FromBrowserContext(context))
         .release();
   }
 
   return PrinterDetector::CreateCups(Profile::FromBrowserContext(context))
       .release();
 }
 
 bool PrinterDetectorFactory::ServiceIsCreatedWithBrowserContext() const {
   return true;
 }
 
 bool PrinterDetectorFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }
 
 }  // namespace chromeos