Implement and test CanonicalCookie::IsCanonical()

ios/net/cookies/cookie_store_ios_persistent_unittest.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/net/cookies/cookie_store_ios_persistent.h"
 
 #import <Foundation/Foundation.h>
 
 #include <memory>
 
@@ skipping 12 matching lines @@
   static std::unique_ptr<net::CookieStore> Create() {
     return base::MakeUnique<CookieStoreIOSPersistent>(nullptr);
   }
 
   static const bool is_cookie_monster = false;
   static const bool supports_http_only = false;
   static const bool supports_non_dotted_domains = true;
   static const bool preserves_trailing_dots = true;
   static const bool filters_schemes = false;
   static const bool has_path_prefix_bug = false;
+  static const bool forbids_setting_empty_name = false;
   static const int creation_time_granularity_in_ms = 0;
   static const int enforces_prefixes = true;
   static const bool enforce_strict_secure = false;
 
   base::MessageLoop loop_;
 };
 
 INSTANTIATE_TYPED_TEST_CASE_P(InactiveCookieStoreIOS,
                               CookieStoreTest,
                               InactiveCookieStoreIOSTestTraits);
@@ skipping 75 matching lines @@
 TEST_F(CookieStoreIOSPersistentTest, NotSynchronized) {
   // Start fetching the cookie.
   GetCookieCallback callback;
   GetCookies(base::Bind(&GetCookieCallback::Run, base::Unretained(&callback)));
   // Backend loading completes.
   backend_->RunLoadedCallback();
   EXPECT_TRUE(callback.did_run());
   EXPECT_EQ("a=b", callback.cookie_line());
 }
 
-}  // namespace net
+}  // namespace net