Eliminate Shell::RootWindowList in favor of aura::Window::Windows.

ash/shelf/shelf_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/shelf/shelf_layout_manager.h"
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerators/accelerator_table.h"
 #include "ash/ash_switches.h"
 #include "ash/display/display_manager.h"
@@ skipping 861 matching lines @@
   Shell::GetInstance()->display_manager()->SetLayoutForCurrentDisplays(
       display_layout);
   // Put the primary monitor's shelf on the display boundary.
   ShelfLayoutManager* shelf = GetShelfLayoutManager();
   shelf->SetAlignment(SHELF_ALIGNMENT_RIGHT);
 
   // Create a window because the shelf is always shown when no windows are
   // visible.
   CreateTestWidget();
 
-  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
+  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
   ASSERT_EQ(root_windows[0],
             GetShelfWidget()->GetNativeWindow()->GetRootWindow());
 
   shelf->SetAutoHideBehavior(ash::SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS);
   EXPECT_EQ(SHELF_AUTO_HIDE, shelf->visibility_state());
 
   int right_edge = root_windows[0]->GetBoundsInScreen().right() - 1;
   int y = root_windows[0]->GetBoundsInScreen().y();
 
   // Start off the mouse nowhere near the shelf; the shelf should be hidden.
@@ skipping 962 matching lines @@
   shelf->SetAlignment(SHELF_ALIGNMENT_LEFT);
   EXPECT_FALSE(status_area_widget->IsMessageBubbleShown());
   generator.ClickLeftButton();
   EXPECT_TRUE(status_area_widget->IsMessageBubbleShown());
   generator.ClickLeftButton();
   EXPECT_FALSE(status_area_widget->IsMessageBubbleShown());
 }
 
 }  // namespace internal
 }  // namespace ash