Make GetRootWindow() return a Window instead of a RootWindow.

ash/shelf/shelf_tooltip_manager.cc

 // Copyright 2013 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_tooltip_manager.h"
 
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 78 matching lines @@
   set_close_on_esc(false);
   set_close_on_deactivate(false);
   set_use_focusless(true);
   set_accept_events(false);
   set_margins(gfx::Insets(kTooltipTopBottomMargin, kTooltipLeftRightMargin,
                           kTooltipTopBottomMargin, kTooltipLeftRightMargin));
   set_shadow(views::BubbleBorder::SMALL_SHADOW);
   SetLayoutManager(new views::FillLayout());
   // The anchor may not have the widget in tests.
   if (anchor->GetWidget() && anchor->GetWidget()->GetNativeView()) {
-    aura::RootWindow* root_window =
+    aura::Window* root_window =
         anchor->GetWidget()->GetNativeView()->GetRootWindow();
     set_parent_window(ash::Shell::GetInstance()->GetContainer(
         root_window, ash::internal::kShellWindowId_SettingBubbleContainer));
   }
   label_ = new views::Label;
   label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
   label_->SetEnabledColor(kTooltipTextColor);
   AddChildView(label_);
   views::BubbleDelegateView::CreateBubble(this);
 }
@@ skipping 260 matching lines @@
       new base::OneShotTimer<ShelfTooltipManager>();
   new_timer->Start(FROM_HERE,
                    base::TimeDelta::FromMilliseconds(delay_in_ms),
                    this,
                    &ShelfTooltipManager::ShowInternal);
   timer_.reset(new_timer);
 }
 
 }  // namespace internal
 }  // namespace ash