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

ash/wm/overview/window_selector.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/wm/overview/window_selector.h"
 
 #include <algorithm>
 
 #include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
@@ skipping 55 matching lines @@
   bool operator()(WindowSelectorItem* window) const {
     return window->TargetedWindow(target) != NULL;
   }
 
   const aura::Window* target;
 };
 
 // A comparator for locating a selector item for a given root.
 struct WindowSelectorItemForRoot
     : public std::unary_function<WindowSelectorItem*, bool> {
-  explicit WindowSelectorItemForRoot(const aura::RootWindow* root)
+  explicit WindowSelectorItemForRoot(const aura::Window* root)
       : root_window(root) {
   }
 
   bool operator()(WindowSelectorItem* item) const {
     return item->GetRootWindow() == root_window;
   }
 
-  const aura::RootWindow* root_window;
+  const aura::Window* root_window;
 };
 
 // Filter to watch for the termination of a keyboard gesture to cycle through
 // multiple windows.
 class WindowSelectorEventFilter : public ui::EventHandler {
  public:
   WindowSelectorEventFilter(WindowSelector* selector);
   virtual ~WindowSelectorEventFilter();
 
   // Overridden from ui::EventHandler:
@@ skipping 394 matching lines @@
   // If the window is in the observed_windows_ list it needs to continue to be
   // observed.
   if (observed_windows_.find(restore_focus_window_) ==
           observed_windows_.end()) {
     restore_focus_window_->RemoveObserver(this);
   }
   restore_focus_window_ = NULL;
 }
 
 }  // namespace ash