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

ui/shell_dialogs/select_file_dialog_win.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/shell_dialogs/select_file_dialog_win.h"
 
 #include <windows.h>
 #include <commdlg.h>
 #include <shlobj.h>
 
@@ skipping 581 matching lines @@
       aura::HandleSelectFolder(
           UTF16ToWide(title_string),
           base::Bind(&ui::SelectFileDialog::Listener::FileSelected,
                      base::Unretained(listener_)),
           base::Bind(&ui::SelectFileDialog::Listener::FileSelectionCanceled,
                      base::Unretained(listener_)));
       return;
     }
   }
   HWND owner = owning_window && owning_window->GetRootWindow()
-               ? owning_window->GetRootWindow()->GetAcceleratedWidget() : NULL;
+               ? owning_window->GetDispatcher()->GetAcceleratedWidget() : NULL;
 #else
   HWND owner = owning_window;
 #endif
   ExecuteSelectParams execute_params(type, UTF16ToWide(title), default_path,
                                      file_types, file_type_index,
                                      default_extension, BeginRun(owner),
                                      owner, params);
   execute_params.run_state.dialog_thread->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&SelectFileDialogImpl::ExecuteSelectFile, this,
                  execute_params));
 }
 
 bool SelectFileDialogImpl::HasMultipleFileTypeChoicesImpl() {
   return has_multiple_file_type_choices_;
 }
 
 bool SelectFileDialogImpl::IsRunning(gfx::NativeWindow owning_window) const {
 #if defined(USE_AURA)
   if (!owning_window->GetRootWindow())
     return false;
-  HWND owner = owning_window->GetRootWindow()->GetAcceleratedWidget();
+  HWND owner = owning_window->GetDispatcher()->GetAcceleratedWidget();
 #else
   HWND owner = owning_window;
 #endif
   return listener_ && IsRunningDialogForOwner(owner);
 }
 
 void SelectFileDialogImpl::ListenerDestroyed() {
   // Our associated listener has gone away, so we shouldn't call back to it if
   // our worker thread returns after the listener is dead.
   listener_ = NULL;
@@ skipping 309 matching lines @@
   return return_value;
 }
 
 SelectFileDialog* CreateWinSelectFileDialog(
     SelectFileDialog::Listener* listener,
     SelectFilePolicy* policy) {
   return new SelectFileDialogImpl(listener, policy);
 }
 
 }  // namespace ui