Cleanup LocalDiscoveryUIHandler.

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

Index: chrome/browser/extensions/api/cloud_print_private/cloud_print_private_api.cc
diff --git a/chrome/browser/extensions/api/cloud_print_private/cloud_print_private_api.cc b/chrome/browser/extensions/api/cloud_print_private/cloud_print_private_api.cc
index 2f590068b522982da0c1e9ebfe0a242cc3bfe831..e2d77d436db3891986b6ac101f92d150c43fd6bc 100644
--- a/chrome/browser/extensions/api/cloud_print_private/cloud_print_private_api.cc
+++ b/chrome/browser/extensions/api/cloud_print_private/cloud_print_private_api.cc
@@ -15,18 +15,24 @@
 
 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::
@@ -41,23 +47,21 @@ 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;
@@ -73,10 +77,10 @@ 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;
 }
@@ -95,14 +99,15 @@ void CloudPrintPrivateGetPrintersFunction::SendResults(
 
 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));
   }
@@ -121,9 +126,9 @@ 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;
 }