Change scoped_ptr to std::unique_ptr in //net.

net/cookies/cookie_store_test_helpers.cc

Index: net/cookies/cookie_store_test_helpers.cc
diff --git a/net/cookies/cookie_store_test_helpers.cc b/net/cookies/cookie_store_test_helpers.cc
index 0606ec81caf4081a3dc32af70b7db2afd60cb45d..91893393005cc698d57e081986f623dc6d63f92d 100644
--- a/net/cookies/cookie_store_test_helpers.cc
+++ b/net/cookies/cookie_store_test_helpers.cc
@@ -205,13 +205,13 @@ void DelayedCookieMonster::FlushStore(const base::Closure& callback) {
   ADD_FAILURE();
 }
 
-scoped_ptr<CookieStore::CookieChangedSubscription>
+std::unique_ptr<CookieStore::CookieChangedSubscription>
 DelayedCookieMonster::AddCallbackForCookie(
     const GURL& url,
     const std::string& name,
     const CookieChangedCallback& callback) {
   ADD_FAILURE();
-  return scoped_ptr<CookieStore::CookieChangedSubscription>();
+  return std::unique_ptr<CookieStore::CookieChangedSubscription>();
 }
 
 bool DelayedCookieMonster::IsEphemeral() {