Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/gtk2_event_loop.cc

Index: chrome/browser/ui/libgtkui/gtk2_event_loop.cc
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_event_loop.cc b/chrome/browser/ui/libgtkui/gtk2_event_loop.cc
similarity index 96%
rename from chrome/browser/ui/libgtk2ui/gtk2_event_loop.cc
rename to chrome/browser/ui/libgtkui/gtk2_event_loop.cc
index 7e23497b27ffcdbc8b5a39736649b041d4b2a1ae..79b47fa504f9d7af3ee887458cb11946051e8ba6 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_event_loop.cc
+++ b/chrome/browser/ui/libgtkui/gtk2_event_loop.cc
@@ -2,7 +2,7 @@
 // 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_event_loop.h"
+#include "chrome/browser/ui/libgtkui/gtk2_event_loop.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
@@ -13,7 +13,7 @@
 #include "ui/events/platform/x11/x11_event_source.h"
 #include "ui/gfx/x/x11_types.h"
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 // static
 Gtk2EventLoop* Gtk2EventLoop::GetInstance() {
@@ -79,4 +79,4 @@ void Gtk2EventLoop::ProcessGdkEventKey(const GdkEventKey& gdk_event_key) {
     XPutBackEvent(x_event.xkey.display, &x_event);
 }
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui