Remove some unused files in libgtk2ui

chrome/browser/ui/libgtk2ui/gtk2_signal_registrar.h

-// Copyright (c) 2011 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.
-
-#ifndef CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_
-
-#include <glib.h>
-#include <map>
-#include <vector>
-
-#include "base/basictypes.h"
-
-typedef void (*GCallback) (void);
-typedef struct _GObject GObject;
-typedef struct _GtkWidget GtkWidget;
-
-namespace libgtk2ui {
-
-// A class that ensures that callbacks don't run on stale owner objects. Similar
-// in spirit to NotificationRegistrar. Use as follows:
-//
-//   class ChromeObject {
-//    public:
-//     ChromeObject() {
-//       ...
-//
-//       signals_.Connect(widget, "event", CallbackThunk, this);
-//     }
-//
-//     ...
-//
-//    private:
-//     Gtk2SignalRegistrar signals_;
-//   };
-//
-// When |signals_| goes down, it will disconnect the handlers connected via
-// Connect.
-class Gtk2SignalRegistrar {
- public:
-  Gtk2SignalRegistrar();
-  ~Gtk2SignalRegistrar();
-
-  // Connect before the default handler. Returns the handler id.
-  glong Connect(gpointer instance, const gchar* detailed_signal,
-                GCallback signal_handler, gpointer data);
-  // Connect after the default handler. Returns the handler id.
-  glong ConnectAfter(gpointer instance, const gchar* detailed_signal,
-                     GCallback signal_handler, gpointer data);
-
-  // Disconnects all signal handlers connected to |instance|.
-  void DisconnectAll(gpointer instance);
-
- private:
-  typedef std::vector<glong> HandlerList;
-  typedef std::map<GObject*, HandlerList> HandlerMap;
-
-  static void WeakNotifyThunk(gpointer data, GObject* where_the_object_was) {
-    reinterpret_cast<Gtk2SignalRegistrar*>(data)->WeakNotify(
-        where_the_object_was);
-  }
-  void WeakNotify(GObject* where_the_object_was);
-
-  glong ConnectInternal(gpointer instance, const gchar* detailed_signal,
-                        GCallback signal_handler, gpointer data, bool after);
-
-  HandlerMap handler_lists_;
-
-  DISALLOW_COPY_AND_ASSIGN(Gtk2SignalRegistrar);
-};
-
-}  // namespace libgtk2ui
-
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_