Remove base::Value::CreateNullValue

chrome/browser/extensions/api/cookies/cookies_api.cc

Index: chrome/browser/extensions/api/cookies/cookies_api.cc
diff --git a/chrome/browser/extensions/api/cookies/cookies_api.cc b/chrome/browser/extensions/api/cookies/cookies_api.cc
index 4939ff28c039fe0ce44ac5a21d8aecaa683cdd06..cee1a77fd54341bdef6a46ba4e7ba49e0b11f67e 100644
--- a/chrome/browser/extensions/api/cookies/cookies_api.cc
+++ b/chrome/browser/extensions/api/cookies/cookies_api.cc
@@ -13,6 +13,7 @@
 #include "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
+#include "base/memory/ptr_util.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ -258,7 +259,7 @@ void CookiesGetFunction::GetCookieCallback(const net::CookieList& cookie_list) {
 
   // The cookie doesn't exist; return null.
   if (!results_)
-    SetResult(base::Value::CreateNullValue());
+    SetResult(base::MakeUnique<base::Value>());
 
   bool rv = BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,