Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/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/libgtk2ui/select_file_dialog_impl.h"
+#include "chrome/browser/ui/libgtkui/select_file_dialog_impl.h"
 
 #include "base/environment.h"
 #include "base/files/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 libgtk2ui {
+namespace libgtkui {
 
 base::FilePath* SelectFileDialogImpl::last_saved_path_ = NULL;
 base::FilePath* SelectFileDialogImpl::last_opened_path_ = NULL;
 
 // static
 ui::SelectFileDialog* SelectFileDialogImpl::Create(
     ui::SelectFileDialog::Listener* listener,
     ui::SelectFilePolicy* policy) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (use_kde_ == UNKNOWN) {
@@ skipping 43 matching lines @@
 void SelectFileDialogImpl::ListenerDestroyed() {
   listener_ = NULL;
 }
 
 bool SelectFileDialogImpl::CallDirectoryExistsOnUIThread(
     const base::FilePath& path) {
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   return base::DirectoryExists(path);
 }
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui