Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/printing_gtk2_util.h

Index: chrome/browser/ui/libgtkui/printing_gtk2_util.h
diff --git a/chrome/browser/ui/libgtk2ui/printing_gtk2_util.h b/chrome/browser/ui/libgtkui/printing_gtk2_util.h
similarity index 80%
rename from chrome/browser/ui/libgtk2ui/printing_gtk2_util.h
rename to chrome/browser/ui/libgtkui/printing_gtk2_util.h
index 6df33f854de78dc126a396fc7bbf9b1e04dfcfdd..84f88db9b9ecdb4b4e8d8bb73b55ea389a60a4b2 100644
--- a/chrome/browser/ui/libgtk2ui/printing_gtk2_util.h
+++ b/chrome/browser/ui/libgtkui/printing_gtk2_util.h
@@ -2,8 +2,8 @@
 // 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_PRINTING_GTK2_UTIL_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_PRINTING_GTK2_UTIL_H_
+#ifndef CHROME_BROWSER_UI_LIBGTKUI_PRINTING_GTK2_UTIL_H_
+#define CHROME_BROWSER_UI_LIBGTKUI_PRINTING_GTK2_UTIL_H_
 
 #include "ui/gfx/geometry/size.h"
 
@@ -24,4 +24,4 @@ void InitPrintSettingsGtk(GtkPrintSettings* settings,
                           GtkPageSetup* page_setup,
                           printing::PrintSettings* print_settings);
 
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_PRINTING_GTK2_UTIL_H_
+#endif  // CHROME_BROWSER_UI_LIBGTKUI_PRINTING_GTK2_UTIL_H_