Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/gtk2_status_icon.h

Index: chrome/browser/ui/libgtkui/gtk2_status_icon.h
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_status_icon.h b/chrome/browser/ui/libgtkui/gtk2_status_icon.h
similarity index 84%
rename from chrome/browser/ui/libgtk2ui/gtk2_status_icon.h
rename to chrome/browser/ui/libgtkui/gtk2_status_icon.h
index a82e7e1911f88d3438d4ea022b7da1b5c7408843..f5be3a8d1164684a47370477eaf86c439f88fa4f 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_status_icon.h
+++ b/chrome/browser/ui/libgtkui/gtk2_status_icon.h
@@ -2,14 +2,14 @@
 // 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_GTK2_STATUS_ICON_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_STATUS_ICON_H_
+#ifndef CHROME_BROWSER_UI_LIBGTKUI_GTK2_STATUS_ICON_H_
+#define CHROME_BROWSER_UI_LIBGTKUI_GTK2_STATUS_ICON_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
-#include "chrome/browser/ui/libgtk2ui/gtk2_signal.h"
+#include "chrome/browser/ui/libgtkui/gtk2_signal.h"
 #include "ui/base/glib/glib_integers.h"
 #include "ui/base/glib/glib_signal.h"
 #include "ui/views/linux_ui/status_icon_linux.h"
@@ -24,7 +24,7 @@ namespace ui {
 class MenuModel;
 }
 
-namespace libgtk2ui {
+namespace libgtkui {
 class AppIndicatorIconMenu;
 
 // Status icon implementation which uses the system tray X11 spec (via
@@ -57,6 +57,6 @@ class Gtk2StatusIcon : public views::StatusIconLinux {
   DISALLOW_COPY_AND_ASSIGN(Gtk2StatusIcon);
 };
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui
 
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_STATUS_ICON_H_
+#endif  // CHROME_BROWSER_UI_LIBGTKUI_GTK2_STATUS_ICON_H_