cros: Move LockWindow from chrome to ash

chrome/browser/chromeos/login/lock/screen_locker.cc

Index: chrome/browser/chromeos/login/lock/screen_locker.cc
diff --git a/chrome/browser/chromeos/login/lock/screen_locker.cc b/chrome/browser/chromeos/login/lock/screen_locker.cc
index 0d1730e08e86ce9b4f0b21de6a0a4a69c68935c2..e0b05e96e74706aa3dc4f823345f830c464ae105 100644
--- a/chrome/browser/chromeos/login/lock/screen_locker.cc
+++ b/chrome/browser/chromeos/login/lock/screen_locker.cc
@@ -242,16 +242,13 @@ void ScreenLocker::Init() {
     owns_delegate_ = true;
 
     // Create and display lock screen.
-    // TODO(jdufualt): LockWindow should live in ash.
     // TODO(jdufault): Calling ash::ShowLockScreenInWidget should be a mojo
     // call. We should only set the session state to locked after the mojo call
     // has completed.
-    LockWindow* lock_window = new LockWindow();
-    lock_window->SetBounds(
-        display::Screen::GetScreen()->GetPrimaryDisplay().bounds());
-    ash::ShowLockScreenInWidget(lock_window);
-    session_manager::SessionManager::Get()->SetSessionState(
-        session_manager::SessionState::LOCKED);
+    if (ash::ShowLockScreen()) {
+      session_manager::SessionManager::Get()->SetSessionState(
+          session_manager::SessionState::LOCKED);
+    }
   } else {
     web_ui_.reset(new WebUIScreenLocker(this));
     delegate_ = web_ui_.get();