Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/gtk2_event_loop.h

Index: chrome/browser/ui/libgtkui/gtk2_event_loop.h
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_event_loop.h b/chrome/browser/ui/libgtkui/gtk2_event_loop.h
similarity index 77%
rename from chrome/browser/ui/libgtk2ui/gtk2_event_loop.h
rename to chrome/browser/ui/libgtkui/gtk2_event_loop.h
index 5ba99d5c8059d80f132405590626e4611a966f7e..a2071c1d351c4257ef4757610c1275f4496646f2 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_event_loop.h
+++ b/chrome/browser/ui/libgtkui/gtk2_event_loop.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_GTK2_EVENT_LOOP_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_EVENT_LOOP_H_
+#ifndef CHROME_BROWSER_UI_LIBGTKUI_GTK2_EVENT_LOOP_H_
+#define CHROME_BROWSER_UI_LIBGTKUI_GTK2_EVENT_LOOP_H_
 
 #include "base/macros.h"
 #include "ui/base/glib/glib_integers.h"
@@ -15,7 +15,7 @@ namespace base {
 template<typename Type> struct DefaultSingletonTraits;
 }
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 class Gtk2EventLoop {
  public:
@@ -33,6 +33,6 @@ class Gtk2EventLoop {
   DISALLOW_COPY_AND_ASSIGN(Gtk2EventLoop);
 };
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui
 
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_EVENT_LOOP_H_
+#endif  // CHROME_BROWSER_UI_LIBGTKUI_GTK2_EVENT_LOOP_H_