Add browser_tests to the GN build.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 27d4b554776526ee41fcb004482598049f342b75..a789bedf41f0aabad7c3428e074d46ed65723600 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -959,14 +959,8 @@ source_set("test_support") {
       "chromeos/login/fake_login_utils.h",
       "chromeos/login/mock_login_utils.cc",
       "chromeos/login/mock_login_utils.h",
-      "chromeos/login/users/avatar/mock_user_image_manager.cc",
-      "chromeos/login/users/avatar/mock_user_image_manager.h",
-      "chromeos/login/users/fake_supervised_user_manager.cc",
-      "chromeos/login/users/fake_supervised_user_manager.h",
-      "chromeos/login/users/fake_user_manager.cc",
-      "chromeos/login/users/fake_user_manager.h",
-      "chromeos/login/users/mock_user_manager.cc",
-      "chromeos/login/users/mock_user_manager.h",
+      "chromeos/login/screens/mock_device_disabled_screen_actor.cc",
+      "chromeos/login/screens/mock_device_disabled_screen_actor.h",
       "chromeos/login/test/oobe_screen_waiter.cc",
       "chromeos/login/test/oobe_screen_waiter.h",
       "chromeos/login/test/js_checker.cc",
@@ -975,6 +969,14 @@ source_set("test_support") {
       "chromeos/login/ui/mock_login_display.h",
       "chromeos/login/ui/mock_login_display_host.cc",
       "chromeos/login/ui/mock_login_display_host.h",
+      "chromeos/login/users/avatar/mock_user_image_manager.cc",
+      "chromeos/login/users/avatar/mock_user_image_manager.h",
+      "chromeos/login/users/fake_supervised_user_manager.cc",
+      "chromeos/login/users/fake_supervised_user_manager.h",
+      "chromeos/login/users/fake_user_manager.cc",
+      "chromeos/login/users/fake_user_manager.h",
+      "chromeos/login/users/mock_user_manager.cc",
+      "chromeos/login/users/mock_user_manager.h",
       "chromeos/net/network_portal_detector_test_utils.cc",
       "chromeos/net/network_portal_detector_test_utils.h",
       "chromeos/policy/cloud_external_data_manager_base_test_util.cc",
@@ -1032,6 +1034,8 @@ source_set("test_support") {
       "extensions/test_blacklist_state_fetcher.h",
       "extensions/test_extension_environment.cc",
       "extensions/test_extension_environment.h",
+      "extensions/test_extension_dir.cc",
+      "extensions/test_extension_dir.h",
       "extensions/test_extension_prefs.cc",
       "extensions/test_extension_prefs.h",
       "extensions/test_extension_service.cc",
@@ -1055,6 +1059,8 @@ source_set("test_support") {
     sources += [
       "ui/app_list/test/chrome_app_list_test_support.cc",
       "ui/app_list/test/chrome_app_list_test_support.h",
+      "ui/app_list/test/test_app_list_controller_delegate.cc",
+      "ui/app_list/test/test_app_list_controller_delegate.h",
     ]
   }