Remove base::Value::CreateNullValue

chrome/browser/extensions/api/tabs/tabs_api.cc

Index: chrome/browser/extensions/api/tabs/tabs_api.cc
diff --git a/chrome/browser/extensions/api/tabs/tabs_api.cc b/chrome/browser/extensions/api/tabs/tabs_api.cc
index fb448f7971c488fbccf548c734d63c4e4d2e6cfe..e4ec50d3ce1cbe127880073ff250eaddf86ab6fd 100644
--- a/chrome/browser/extensions/api/tabs/tabs_api.cc
+++ b/chrome/browser/extensions/api/tabs/tabs_api.cc
@@ -658,7 +658,7 @@ ExtensionFunction::ResponseAction WindowsCreateFunction::Run() {
       !browser_context()->IsOffTheRecord() && !include_incognito()) {
     // Don't expose incognito windows if extension itself works in non-incognito
     // profile and CanCrossIncognito isn't allowed.
-    result = base::Value::CreateNullValue();
+    result = base::MakeUnique<base::Value>();
   } else {
     result = controller->CreateWindowValueWithTabs(extension());
   }