views: Add a cross-platform SelectFileDialogExtension API.

chrome/browser/ui/views/select_file_dialog_extension_factory.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 "chrome/browser/ui/views/select_file_dialog_extension_factory.h"
 
-#include "chrome/browser/ui/views/select_file_dialog_extension.h"
+#include "chrome/browser/ui/views/select_file_dialog_extension_views.h"
 
 SelectFileDialogExtensionFactory::SelectFileDialogExtensionFactory() {
 }
 
 SelectFileDialogExtensionFactory::~SelectFileDialogExtensionFactory() {
 }
 
 ui::SelectFileDialog* SelectFileDialogExtensionFactory::Create(
     ui::SelectFileDialog::Listener* listener,
     ui::SelectFilePolicy* policy) {
-  return SelectFileDialogExtension::Create(listener, policy);
+  return SelectFileDialogExtensionViews::Create(listener, policy);
 }