cros: Only preload the lock screen; do not reuse it.

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index 26ffc2ec41028c795ccac87dfdd8673bcae8c39b..de6d34d13633d92ccb1d00eb1e0d27fe33050815 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -892,11 +892,11 @@ source_set("chromeos") {
     "login/ui/login_web_dialog.h",
     "login/ui/models/user_board_model.cc",
     "login/ui/models/user_board_model.h",
+    "login/ui/preloaded_web_view.cc",
+    "login/ui/preloaded_web_view.h",
+    "login/ui/preloaded_web_view_factory.cc",
+    "login/ui/preloaded_web_view_factory.h",
     "login/ui/proxy_settings_dialog.cc",
-    "login/ui/shared_web_view.cc",
-    "login/ui/shared_web_view.h",
-    "login/ui/shared_web_view_factory.cc",
-    "login/ui/shared_web_view_factory.h",
     "login/ui/simple_web_view_dialog.cc",
     "login/ui/simple_web_view_dialog.h",
     "login/ui/user_adding_screen.cc",
@@ -907,8 +907,6 @@ source_set("chromeos") {
     "login/ui/web_contents_forced_title.h",
     "login/ui/web_contents_set_background_color.cc",
     "login/ui/web_contents_set_background_color.h",
-    "login/ui/web_view_handle.cc",
-    "login/ui/web_view_handle.h",
     "login/ui/webui_login_display.cc",
     "login/ui/webui_login_display.h",
     "login/ui/webui_login_view.cc",