mash: remove the LockStateControllerDelegate.

ash/test/BUILD.gn

Index: ash/test/BUILD.gn
diff --git a/ash/test/BUILD.gn b/ash/test/BUILD.gn
index e804ea51728ab40b2eae4b206fe999c6d337ca46..2b840f7b37f6a627e174218f802bace97f8195b5 100644
--- a/ash/test/BUILD.gn
+++ b/ash/test/BUILD.gn
@@ -85,6 +85,8 @@ static_library("test_support_common") {
     "cursor_manager_test_api.h",
     "immersive_fullscreen_controller_test_api.cc",
     "immersive_fullscreen_controller_test_api.h",
+    "lock_state_controller_test_api.cc",
+    "lock_state_controller_test_api.h",
     "mirror_window_test_api.cc",
     "mirror_window_test_api.h",
     "overflow_bubble_view_test_api.cc",
@@ -103,8 +105,6 @@ static_library("test_support_common") {
     "test_activation_delegate.h",
     "test_keyboard_ui.cc",
     "test_keyboard_ui.h",
-    "test_lock_state_controller_delegate.cc",
-    "test_lock_state_controller_delegate.h",
     "test_overlay_delegate.cc",
     "test_overlay_delegate.h",
     "test_screenshot_delegate.cc",
@@ -113,6 +113,8 @@ static_library("test_support_common") {
     "test_session_state_animator.h",
     "test_shell_delegate.cc",
     "test_shell_delegate.h",
+    "test_shutdown_client.cc",
+    "test_shutdown_client.h",
     "test_suite.cc",
     "test_suite.h",
     "test_suite_init.h",
@@ -137,6 +139,7 @@ static_library("test_support_common") {
   deps = [
     "//ash/common/test:test_support",
     "//ash/public/cpp",
+    "//ash/public/interfaces",
     "//ash/resources",
     "//base:i18n",
     "//base/test:test_support",