Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/select_file_dialog_impl_kde.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 <stddef.h>
 #include <X11/Xlib.h>
 
 #include <memory>
 #include <set>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/nix/mime_util_xdg.h"
 #include "base/nix/xdg_util.h"
 #include "base/process/launch.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
-#include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
+#include "chrome/browser/ui/libgtkui/select_file_dialog_impl.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/strings/grit/ui_strings.h"
 
 // These conflict with base/tracked_objects.h, so need to come last.
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 
 using content::BrowserThread;
 
 namespace {
 
 std::string GetTitle(const std::string& title, int message_id) {
   return title.empty() ? l10n_util::GetStringUTF8(message_id) : title;
 }
 
 const char kKdialogBinary[] = "kdialog";
 
 }  // namespace
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 // Implementation of SelectFileDialog that shows a KDE common dialog for
 // choosing a file or folder. This acts as a modal dialog.
 class SelectFileDialogImplKDE : public SelectFileDialogImpl {
  public:
   SelectFileDialogImplKDE(Listener* listener,
                           ui::SelectFilePolicy* policy,
                           base::nix::DesktopEnvironment desktop);
 
  protected:
@@ skipping 459 matching lines @@
     filenames_fp.push_back(path);
   }
 
   if (filenames_fp.empty()) {
     FileNotSelected(params);
     return;
   }
   MultiFilesSelected(filenames_fp, params);
 }
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui