Don't activate a window if screen is locked.

chrome/browser/chromeos/login/webui_login_display_host.cc

Index: chrome/browser/chromeos/login/webui_login_display_host.cc
diff --git a/chrome/browser/chromeos/login/webui_login_display_host.cc b/chrome/browser/chromeos/login/webui_login_display_host.cc
index 46a636ee9af41e28097a29ea9d58fc7e1e03961d..28681c90474e3954a5640020abdaa069697f6383 100644
--- a/chrome/browser/chromeos/login/webui_login_display_host.cc
+++ b/chrome/browser/chromeos/login/webui_login_display_host.cc
@@ -15,7 +15,6 @@
 
 #if defined(USE_AURA)
 #include "ash/shell.h"
-#include "ash/shell_window_ids.h"
 #include "ui/aura/window.h"
 #endif
 
@@ -131,9 +130,9 @@ void WebUILoginDisplayHost::LoadURL(const GURL& url) {
     login_view_->Init(login_window_);
 
 #if defined(USE_AURA)
-    ash::Shell::GetInstance()->GetContainer(
-        ash::internal::kShellWindowId_LockScreenContainer)->
-        AddChild(login_window_->GetNativeView());
+    login_window_->GetNativeView()->set_stops_event_propagation(true);
+    // Let the shell pick the container.
+    login_window_->GetNativeView()->SetParent(NULL);
 #endif
 
     login_window_->SetContentsView(login_view_);