ash: Fix event processing in modal windows in login/lock screen.

ash/wm/system_modal_container_layout_manager_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/system_modal_container_layout_manager.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
@@ skipping 21 matching lines @@
 }
 
 bool AllRootWindowsHaveModalBackgrounds() {
   Shell::RootWindowControllerList controllers =
       Shell::GetAllRootWindowControllers();
   bool has_modal_screen = !controllers.empty();
   for (Shell::RootWindowControllerList::const_iterator iter =
            controllers.begin();
        iter != controllers.end(); ++iter) {
     has_modal_screen &=
-        (*iter)->GetSystemModalLayoutManager()->has_modal_background();
+        (*iter)->GetSystemModalLayoutManager(NULL)->has_modal_background();
   }
   return has_modal_screen;
 }
 
 class TestWindow : public views::WidgetDelegateView {
  public:
   explicit TestWindow(bool modal) : modal_(modal) {}
   virtual ~TestWindow() {}
 
   static aura::Window* OpenTestWindow(aura::Window* parent, bool modal) {
@@ skipping 351 matching lines @@
   EXPECT_TRUE(wm::IsActiveWindow(modal1.get()));
 
   // No more modal screen.
   modal1.reset();
   EXPECT_FALSE(AllRootWindowsHaveModalBackgrounds());
   EXPECT_TRUE(wm::IsActiveWindow(normal.get()));
 }
 
 }  // namespace test
 }  // namespace ash