Remove superfluous cookies.clear() call in test.

Change-Id: I46134d1283708ae8dd79c28cc65d4a180e9baef2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884970Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710041}

net/extras/sqlite/sqlite_persistent_cookie_store_unittest.cc

@@ -805,8 +805,6 @@ TEST_F(SQLitePersistentCookieStoreTest, SameSiteIsPersistent) {
 
   ASSERT_EQ(1u, cookie_map.count(kStrictName));
   EXPECT_EQ(CookieSameSite::STRICT_MODE, cookie_map[kStrictName]->SameSite());
-
-  cookies.clear();
 }
 
 TEST_F(SQLitePersistentCookieStoreTest, UpdateToEncryption) {