Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/select_file_dialog_impl_gtk2.h

Index: chrome/browser/ui/libgtkui/select_file_dialog_impl_gtk2.h
diff --git a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.h b/chrome/browser/ui/libgtkui/select_file_dialog_impl_gtk2.h
similarity index 91%
rename from chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.h
rename to chrome/browser/ui/libgtkui/select_file_dialog_impl_gtk2.h
index 5407aec895a9c7a5a4cd70addeaa6a4936613508..98416797756fd98bb51d733c29a783376f407c0e 100644
--- a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.h
+++ b/chrome/browser/ui/libgtkui/select_file_dialog_impl_gtk2.h
@@ -2,15 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_UI_LIBGTK2UI_SELECT_FILE_DIALOG_IMPL_GTK2_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_SELECT_FILE_DIALOG_IMPL_GTK2_H_
+#ifndef CHROME_BROWSER_UI_LIBGTKUI_SELECT_FILE_DIALOG_IMPL_GTK2_H_
+#define CHROME_BROWSER_UI_LIBGTKUI_SELECT_FILE_DIALOG_IMPL_GTK2_H_
 
 #include "base/macros.h"
-#include "chrome/browser/ui/libgtk2ui/gtk2_signal.h"
-#include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
-#include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
+#include "chrome/browser/ui/libgtkui/gtk2_signal.h"
+#include "chrome/browser/ui/libgtkui/gtk2_util.h"
+#include "chrome/browser/ui/libgtkui/select_file_dialog_impl.h"
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 // Implementation of SelectFileDialog that shows a Gtk common dialog for
 // choosing a file or folder. This acts as a modal dialog.
@@ -126,6 +126,6 @@ class SelectFileDialogImplGTK : public SelectFileDialogImpl,
   DISALLOW_COPY_AND_ASSIGN(SelectFileDialogImplGTK);
 };
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui
 
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_SELECT_FILE_DIALOG_IMPL_GTK2_H_
+#endif  // CHROME_BROWSER_UI_LIBGTKUI_SELECT_FILE_DIALOG_IMPL_GTK2_H_