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

ui/views/corewm/tooltip_controller.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 "ui/views/corewm/tooltip_controller.h"
 
 #include <vector>
 
 #include "base/time/time.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/env.h"
-#include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/events/event.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/corewm/tooltip.h"
 #include "ui/views/widget/tooltip_manager.h"
 
 namespace {
 
 const int kTooltipTimeoutMs = 500;
@@ skipping 203 matching lines @@
   if (!tooltip_window_)
     return false;
   aura::client::DragDropClient* client =
       aura::client::GetDragDropClient(tooltip_window_->GetRootWindow());
   return client && client->IsDragDropInProgress();
 }
 
 bool TooltipController::IsCursorVisible() {
   if (!tooltip_window_)
     return false;
-  aura::RootWindow* root = tooltip_window_->GetRootWindow();
+  aura::Window* root = tooltip_window_->GetRootWindow();
   if (!root)
     return false;
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(root);
   // |cursor_client| may be NULL in tests, treat NULL as always visible.
   return !cursor_client || cursor_client->IsCursorVisible();
 }
 
 int TooltipController::GetTooltipShownTimeout() {
   std::map<aura::Window*, int>::const_iterator it =
       tooltip_shown_timeout_map_.find(tooltip_window_);
   if (it == tooltip_shown_timeout_map_.end())
     return kDefaultTooltipShownTimeoutMs;
   return it->second;
 }
 
 }  // namespace corewm
 }  // namespace views