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

ash/tooltips/tooltip_controller_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/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/aura/client/tooltip_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
@@ skipping 120 matching lines @@
   RunAllPendingInMessageLoop();
   helper_->FireTooltipTimer();
   EXPECT_TRUE(helper_->IsTooltipVisible());
 }
 
 TEST_F(TooltipControllerTest, TooltipsOnMultiDisplayShouldNotCrash) {
   if (!SupportsMultipleDisplays())
     return;
 
   UpdateDisplay("1000x600,600x400");
-  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
+  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
   scoped_ptr<views::Widget> widget1(CreateNewWidgetWithBoundsOn(
       0, gfx::Rect(10, 10, 100, 100)));
   TooltipTestView* view1 = new TooltipTestView;
   AddViewToWidgetAndResize(widget1.get(), view1);
   view1->set_tooltip_text(ASCIIToUTF16("Tooltip Text for view 1"));
   EXPECT_EQ(widget1->GetNativeView()->GetRootWindow(), root_windows[0]);
 
   scoped_ptr<views::Widget> widget2(CreateNewWidgetWithBoundsOn(
       1, gfx::Rect(1200, 10, 100, 100)));
   TooltipTestView* view2 = new TooltipTestView;
@@ skipping 23 matching lines @@
   // be able to show tooltips on the primary display.
   aura::test::EventGenerator generator1(root_windows[0]);
   generator1.MoveMouseRelativeTo(widget1->GetNativeView(),
                                  view1->bounds().CenterPoint());
   helper_->FireTooltipTimer();
   EXPECT_TRUE(helper_->IsTooltipVisible());
 }
 
 }  // namespace test
 }  // namespace ash