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 346eb48fe4842489fc11b4f83991877791770954..ed86cdccd453fb63ba74827b67a19da03f783c05 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -894,11 +894,11 @@ 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",
@@ -909,8 +909,6 @@ 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",