Refactor net tests to use GMock matchers for checking net::Error results

net/cert/internal/name_constraints_unittest.cc

Index: net/cert/internal/name_constraints_unittest.cc
diff --git a/net/cert/internal/name_constraints_unittest.cc b/net/cert/internal/name_constraints_unittest.cc
index f61e1da5c2d9e49186ac16a3227af7c0d4f13d28..2f8b8a3f5a48e8efdf23ba0b0e6b5878d99aafe8 100644
--- a/net/cert/internal/name_constraints_unittest.cc
+++ b/net/cert/internal/name_constraints_unittest.cc
@@ -8,8 +8,12 @@
 
 #include "net/base/ip_address.h"
 #include "net/cert/internal/test_helpers.h"
+#include "net/test/gtest_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using net::test::IsOk;
+
 namespace net {
 namespace {