Implement and test CanonicalCookie::IsCanonical()

ios/net/cookies/cookie_store_ios_unittest.mm

 // Copyright 2012 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.
 
 #include "ios/net/cookies/cookie_store_ios.h"
 
 #import <Foundation/Foundation.h>
 
 #include <memory>
 
@@ skipping 15 matching lines @@
     ClearCookies();
     return base::MakeUnique<CookieStoreIOS>(
         [NSHTTPCookieStorage sharedHTTPCookieStorage]);
   }
 
   static const bool supports_http_only = false;
   static const bool supports_non_dotted_domains = false;
   static const bool preserves_trailing_dots = false;
   static const bool filters_schemes = false;
   static const bool has_path_prefix_bug = true;
+  static const bool forbids_setting_empty_name = true;
   static const int creation_time_granularity_in_ms = 1000;
 
   base::MessageLoop loop_;
 };
 
 INSTANTIATE_TYPED_TEST_CASE_P(CookieStoreIOS,
                               CookieStoreTest,
                               CookieStoreIOSTestTraits);
 
 
@@ skipping 357 matching lines @@
   SetSystemCookie(kTestCookieURL, "abc", "ghi");
   EXPECT_EQ(2U, cookies.size());
   // this deletes the callback
   handle.reset();
   SetSystemCookie(kTestCookieURL, "abc", "jkl");
   EXPECT_EQ(2U, cookies.size());
   DeleteSystemCookie(kTestCookieURL, "abc");
 }
 
 }  // namespace net