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

ash/wm/workspace/workspace_event_handler_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/workspace/workspace_event_handler.h"
 
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_state.h"
@@ skipping 140 matching lines @@
   // Multi display test does not run on Win8 bot. crbug.com/247427.
   if (base::win::GetVersion() >= base::win::VERSION_WIN8)
     return;
 #endif
 
   // Verify the double clicking the resize edge works on 2nd display too.
   UpdateDisplay("200x200,400x300");
   gfx::Rect work_area2 = ScreenAsh::GetSecondaryDisplay().work_area();
   restored_bounds.SetRect(220,20, 50, 50);
   window->SetBoundsInScreen(restored_bounds, ScreenAsh::GetSecondaryDisplay());
-  aura::RootWindow* second_root = Shell::GetAllRootWindows()[1];
+  aura::Window* second_root = Shell::GetAllRootWindows()[1];
   EXPECT_EQ(second_root, window->GetRootWindow());
   aura::test::EventGenerator generator2(second_root, window.get());
 
   // Y-axis maximization.
   wd.set_window_component(HTTOP);
   generator2.PressLeftButton();
   generator2.ReleaseLeftButton();
   generator2.set_flags(ui::EF_IS_DOUBLE_CLICK);
   generator2.PressLeftButton();
   generator2.MoveMouseTo(generator.current_location(), 1);
@@ skipping 167 matching lines @@
   ASSERT_TRUE(aura::client::GetWindowMoveClient(window->parent()));
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, window.get());
   aura::client::GetWindowMoveClient(window->parent())
       ->RunMoveLoop(window.release(),
                     gfx::Vector2d(),
                     aura::client::WINDOW_MOVE_SOURCE_MOUSE);
 }
 
 }  // namespace internal
 }  // namespace ash