Add more components_unittests to GN build

components/url_matcher/BUILD.gn

Index: components/url_matcher/BUILD.gn
diff --git a/components/url_matcher/BUILD.gn b/components/url_matcher/BUILD.gn
index 7df189b501f1eba0512ffcc9890787ab42b7287d..9ba616fb81276bc4d7e93325188c8b45f8214bb6 100644
--- a/components/url_matcher/BUILD.gn
+++ b/components/url_matcher/BUILD.gn
@@ -23,7 +23,7 @@ component("url_matcher") {
 
   defines = [ "URL_MATCHER_IMPLEMENTATION" ]
 
-  deps = [
+  public_deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//third_party/re2",
@@ -32,3 +32,18 @@ component("url_matcher") {
 
   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",
+  ]
+}