Fix broken clockstate.network2 histogram and add unit test

components/ssl_errors/BUILD.gn

 # Copyright 2015 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.
 
 static_library("ssl_errors") {
   sources = [
     "error_classification.cc",
     "error_classification.h",
     "error_info.cc",
     "error_info.h",
@@ skipping 13 matching lines @@
 source_set("unit_tests") {
   testonly = true
   sources = [
     "error_classification_unittest.cc",
   ]
 
   deps = [
     ":ssl_errors",
     "//base",
     "//components/network_time",
+    "//components/network_time:network_time_test_support",
     "//components/prefs:test_support",
     "//net:test_support",
     "//testing/gtest",
   ]
 }