Cleanup LocalDiscoveryUIHandler.

chrome/browser/extensions/api/cloud_print_private/cloud_print_private_api.cc

 // Copyright (c) 2012 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/extensions/api/cloud_print_private/cloud_print_private_api.h"
 
 #include <string>
 
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/printing/cloud_print/cloud_print_proxy_service.h"
 #include "chrome/browser/printing/cloud_print/cloud_print_proxy_service_factory.h"
 #include "chrome/common/extensions/api/cloud_print_private.h"
 #include "google_apis/google_api_keys.h"
 #include "net/base/network_interfaces.h"
 
 namespace extensions {
 
-CloudPrintTestsDelegate* CloudPrintTestsDelegate::instance_ = NULL;
+namespace {
 
-CloudPrintTestsDelegate* CloudPrintTestsDelegate::instance() {
-  return instance_;
+const char kErrorIncognito[] = "Cannot access in incognito mode";
+
+CloudPrintTestsDelegate* g_instance = nullptr;
+
+}  // namespace
+
+CloudPrintTestsDelegate* CloudPrintTestsDelegate::Get() {
+  return g_instance;
 }
 
 CloudPrintTestsDelegate::CloudPrintTestsDelegate() {
-  instance_ = this;
+  g_instance = this;
 }
 
 CloudPrintTestsDelegate::~CloudPrintTestsDelegate() {
-  instance_ = NULL;
+  g_instance = nullptr;
 }
 
 CloudPrintPrivateSetupConnectorFunction::
     CloudPrintPrivateSetupConnectorFunction() {
 }
 
 CloudPrintPrivateSetupConnectorFunction::
     ~CloudPrintPrivateSetupConnectorFunction() {
 }
 
 bool CloudPrintPrivateSetupConnectorFunction::RunAsync() {
 #if defined(ENABLE_PRINT_PREVIEW)
   using api::cloud_print_private::SetupConnector::Params;
   std::unique_ptr<Params> params(Params::Create(*args_));
-  if (CloudPrintTestsDelegate::instance()) {
-    CloudPrintTestsDelegate::instance()->SetupConnector(
-        params->user_email,
-        params->robot_email,
-        params->credentials,
+  if (CloudPrintTestsDelegate::Get()) {
+    CloudPrintTestsDelegate::Get()->SetupConnector(
+        params->user_email, params->robot_email, params->credentials,
         params->user_settings);
   } else {
+    std::unique_ptr<base::DictionaryValue> user_settings(
+        params->user_settings.ToValue());
     CloudPrintProxyService* service =
         CloudPrintProxyServiceFactory::GetForProfile(GetProfile());
-    if (!service)
+    if (!service) {
+      error_ = kErrorIncognito;
       return false;
-    std::unique_ptr<base::DictionaryValue> user_setings(
-        params->user_settings.ToValue());
-    service->EnableForUserWithRobot(params->credentials,
-                                    params->robot_email,
-                                    params->user_email,
-                                    *user_setings);
+    }
+    service->EnableForUserWithRobot(params->credentials, params->robot_email,
+                                    params->user_email, *user_settings);
   }
   SendResponse(true);
   return true;
 #else
   return false;
 #endif
 }
 
 CloudPrintPrivateGetHostNameFunction::CloudPrintPrivateGetHostNameFunction() {
 }
 
 CloudPrintPrivateGetHostNameFunction::~CloudPrintPrivateGetHostNameFunction() {
 }
 
 bool CloudPrintPrivateGetHostNameFunction::RunAsync() {
-  SetResult(new base::StringValue(
-      CloudPrintTestsDelegate::instance() ?
-      CloudPrintTestsDelegate::instance()->GetHostName() :
-      net::GetHostName()));
+  SetResult(
+      new base::StringValue(CloudPrintTestsDelegate::Get()
+                                ? CloudPrintTestsDelegate::Get()->GetHostName()
+                                : net::GetHostName()));
   SendResponse(true);
   return true;
 }
 
 CloudPrintPrivateGetPrintersFunction::CloudPrintPrivateGetPrintersFunction() {
 }
 
 CloudPrintPrivateGetPrintersFunction::~CloudPrintPrivateGetPrintersFunction() {
 }
 
 void CloudPrintPrivateGetPrintersFunction::SendResults(
     const std::vector<std::string>& printers) {
   results_ = api::cloud_print_private::GetPrinters::Results::Create(printers);
   SendResponse(true);
 }
 
 bool CloudPrintPrivateGetPrintersFunction::RunAsync() {
 #if defined(ENABLE_PRINT_PREVIEW)
-  std::vector<std::string> result;
-  if (CloudPrintTestsDelegate::instance()) {
-    SendResults(CloudPrintTestsDelegate::instance()->GetPrinters());
+  if (CloudPrintTestsDelegate::Get()) {
+    SendResults(CloudPrintTestsDelegate::Get()->GetPrinters());
   } else {
     CloudPrintProxyService* service =
         CloudPrintProxyServiceFactory::GetForProfile(GetProfile());
-    if (!service)
+    if (!service) {
+      error_ = kErrorIncognito;
       return false;
+    }
     service->GetPrinters(
         base::Bind(&CloudPrintPrivateGetPrintersFunction::SendResults, this));
   }
   return true;
 #else
   return false;
 #endif
 }
 
 
 CloudPrintPrivateGetClientIdFunction::CloudPrintPrivateGetClientIdFunction() {
 }
 
 CloudPrintPrivateGetClientIdFunction::~CloudPrintPrivateGetClientIdFunction() {
 }
 
 bool CloudPrintPrivateGetClientIdFunction::RunAsync() {
   SetResult(new base::StringValue(
-      CloudPrintTestsDelegate::instance() ?
-      CloudPrintTestsDelegate::instance()->GetClientId() :
-      google_apis::GetOAuth2ClientID(google_apis::CLIENT_CLOUD_PRINT)));
+      CloudPrintTestsDelegate::Get()
+          ? CloudPrintTestsDelegate::Get()->GetClientId()
+          : google_apis::GetOAuth2ClientID(google_apis::CLIENT_CLOUD_PRINT)));
   SendResponse(true);
   return true;
 }
 
 }  // namespace extensions