Add more components_unittests to GN build

components/translate/core/browser/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.
 
 source_set("browser") {
   sources = [
     "language_state.cc",
     "language_state.h",
     "options_menu_model.cc",
     "options_menu_model.h",
@@ skipping 33 matching lines @@
     "//components/language_usage_metrics",
     "//components/resources:components_resources",
     "//components/strings",
     "//components/translate/core/common",
     "//net",
     "//third_party/icu",
     "//ui/base",
     "//url",
   ]
 }
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "language_state_unittest.cc",
+    "translate_browser_metrics_unittest.cc",
+    "translate_language_list_unittest.cc",
+    "translate_prefs_unittest.cc",
+    "translate_script_unittest.cc",
+  ]
+  deps = [
+    ":browser",
+    "//testing/gtest",
+  ]
+}