Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/menu_util.cc

Index: chrome/browser/ui/libgtkui/menu_util.cc
diff --git a/chrome/browser/ui/libgtk2ui/menu_util.cc b/chrome/browser/ui/libgtkui/menu_util.cc
similarity index 97%
rename from chrome/browser/ui/libgtk2ui/menu_util.cc
rename to chrome/browser/ui/libgtkui/menu_util.cc
index 6cedac2fa9a75c8feefc2af54c2a0928295e5794..d02313f177f925812eab4681ffc6d70c8fee4a7e 100644
--- a/chrome/browser/ui/libgtk2ui/menu_util.cc
+++ b/chrome/browser/ui/libgtkui/menu_util.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/menu_util.h"
+#include "chrome/browser/ui/libgtkui/menu_util.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
-#include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
-#include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
+#include "chrome/browser/ui/libgtkui/gtk2_util.h"
+#include "chrome/browser/ui/libgtkui/skia_utils_gtk2.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/accelerators/menu_label_accelerator_util_linux.h"
 #include "ui/base/models/menu_model.h"
 
 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 GtkWidget* BuildMenuItemWithImage(const std::string& label, GtkWidget* image) {
   GtkWidget* menu_item = gtk_image_menu_item_new_with_mnemonic(label.c_str());
@@ -261,4 +261,4 @@ void SetMenuItemInfo(GtkWidget* widget, void* block_activation_ptr) {
   }
 }
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui