Clarify that a cookie is persistent.

Change-Id: I95e0dc61710f1512a79b9329e8228e04c2899644
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881508Reviewed-by: Lily Chen <chlily@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709652}

net/extras/sqlite/sqlite_persistent_cookie_store_unittest.cc

@@ -761,7 +761,7 @@ TEST_F(SQLitePersistentCookieStoreTest, SameSiteIsPersistent) {
 
   InitializeStore(false, true);
 
-  // Add a non-samesite cookie.
+  // Add a non-samesite persistent cookie.
   store_->AddCookie(CanonicalCookie(
       kNoneName, kCookieValue, kDomain, kCookiePath,
       base::Time::Now() - base::TimeDelta::FromMinutes(1),