shell dialogs: Move the linux implementations.

ui/base/dialogs/gtk/select_file_dialog_impl.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.
 //
 // This file implements common select dialog functionality between GTK and KDE.
 
-#include "chrome/browser/ui/gtk/select_file_dialog_impl.h"
+#include "ui/base/dialogs/gtk/select_file_dialog_impl.h"
 
 #include "base/environment.h"
 #include "base/file_util.h"
 #include "base/nix/xdg_util.h"
 #include "base/threading/thread_restrictions.h"
-#include "content/public/browser/browser_thread.h"
-
-using content::BrowserThread;
 
 namespace {
 
 enum UseKdeFileDialogStatus {
   UNKNOWN,
   NO_KDE,
   YES_KDE
 };
 
 UseKdeFileDialogStatus use_kde_ = UNKNOWN;
 
 }  // namespace
 
+namespace ui {
+
 FilePath* SelectFileDialogImpl::last_saved_path_ = NULL;
 FilePath* SelectFileDialogImpl::last_opened_path_ = NULL;
 
 // static
-SelectFileDialog* SelectFileDialog::Create(Listener* listener,
-                                           ui::SelectFilePolicy* policy) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+SelectFileDialog* CreateLinuxSelectFileDialog(
+    SelectFileDialog::Listener* listener,
+    SelectFilePolicy* policy) {
   if (use_kde_ == UNKNOWN) {
     // Start out assumimg we are not going to use KDE.
     use_kde_ = NO_KDE;
 
     // Check to see if KDE is the desktop environment.
     scoped_ptr<base::Environment> env(base::Environment::Create());
     base::nix::DesktopEnvironment desktop =
         base::nix::GetDesktopEnvironment(env.get());
     if (desktop == base::nix::DESKTOP_ENVIRONMENT_KDE3 ||
         desktop == base::nix::DESKTOP_ENVIRONMENT_KDE4) {
@@ skipping 35 matching lines @@
 }
 
 bool SelectFileDialogImpl::IsRunning(gfx::NativeWindow parent_window) const {
   return parents_.find(parent_window) != parents_.end();
 }
 
 bool SelectFileDialogImpl::CallDirectoryExistsOnUIThread(const FilePath& path) {
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   return file_util::DirectoryExists(path);
 }
+
+}  // namespace ui