Add more components_unittests to GN build

components/url_matcher/BUILD.gn

 # Copyright 2014 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.
 
 component("url_matcher") {
   sources = [
     "regex_set_matcher.cc",
     "regex_set_matcher.h",
     "string_pattern.cc",
     "string_pattern.h",
     "substring_set_matcher.cc",
     "substring_set_matcher.h",
     "url_matcher.cc",
     "url_matcher.h",
     "url_matcher_constants.cc",
     "url_matcher_constants.h",
     "url_matcher_export.h",
     "url_matcher_factory.cc",
     "url_matcher_factory.h",
     "url_matcher_helpers.cc",
     "url_matcher_helpers.h",
   ]
 
   defines = [ "URL_MATCHER_IMPLEMENTATION" ]
 
-  deps = [
+  public_deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//third_party/re2",
     "//url",
   ]
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 }
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "regex_set_matcher_unittest.cc",
+    "string_pattern_unittest.cc",
+    "substring_set_matcher_unittest.cc",
+    "url_matcher_factory_unittest.cc",
+    "url_matcher_unittest.cc",
+  ]
+  deps = [
+    ":url_matcher",
+    "//testing/gtest",
+  ]
+}