Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/gtk2_status_icon.cc

Index: chrome/browser/ui/libgtkui/gtk2_status_icon.cc
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_status_icon.cc b/chrome/browser/ui/libgtkui/gtk2_status_icon.cc
similarity index 90%
rename from chrome/browser/ui/libgtk2ui/gtk2_status_icon.cc
rename to chrome/browser/ui/libgtkui/gtk2_status_icon.cc
index ef1a680547caf77a9b4dad7a1cadbc2a06d08f3c..b3e692c4be61fb5705a32c5a736f5d859426d14c 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_status_icon.cc
+++ b/chrome/browser/ui/libgtkui/gtk2_status_icon.cc
@@ -2,19 +2,19 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/ui/libgtk2ui/gtk2_status_icon.h"
+#include "chrome/browser/ui/libgtkui/gtk2_status_icon.h"
 
 #include <gtk/gtk.h>
 
 #include "base/strings/utf_string_conversions.h"
-#include "chrome/browser/ui/libgtk2ui/app_indicator_icon_menu.h"
-#include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
+#include "chrome/browser/ui/libgtkui/app_indicator_icon_menu.h"
+#include "chrome/browser/ui/libgtkui/skia_utils_gtk2.h"
 #include "ui/base/models/menu_model.h"
 #include "ui/gfx/image/image_skia.h"
 
 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 Gtk2StatusIcon::Gtk2StatusIcon(const gfx::ImageSkia& image,
                                const base::string16& tool_tip) {
@@ -75,4 +75,4 @@ void Gtk2StatusIcon::OnContextMenuRequested(GtkStatusIcon* status_icon,
   }
 }
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui