Move Singleton and related structs to namespace base

chrome/browser/ui/libgtk2ui/gtk2_event_loop.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // 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 <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 #include <X11/X.h>
 #include <X11/Xlib.h>
 
 #include "base/memory/singleton.h"
 #include "ui/gfx/x/x11_types.h"
 
 namespace libgtk2ui {
 
 // static
 Gtk2EventLoop* Gtk2EventLoop::GetInstance() {
-  return Singleton<Gtk2EventLoop>::get();
+  return base::Singleton<Gtk2EventLoop>::get();
 }
 
 Gtk2EventLoop::Gtk2EventLoop() {
   gdk_event_handler_set(DispatchGdkEvent, NULL, NULL);
 }
 
 Gtk2EventLoop::~Gtk2EventLoop() {
   gdk_event_handler_set(reinterpret_cast<GdkEventFunc>(gtk_main_do_event),
                         NULL, NULL);
 }
@@ skipping 45 matching lines @@
   // the upper 16 bits into another unused field. (crbug.com/524084)
   x_event.xkey.x = x_event.xkey.y = -1;
   x_event.xkey.x_root  = gdk_event_key.hardware_keycode;
   x_event.xkey.y_root = gdk_event_key.state >> 16;
 
   XSendEvent(x_event.xkey.display, x_event.xkey.window, true, KeyPressMask,
              &x_event);
 }
 
 }  // namespace libgtk2ui