Remove some unused files in libgtk2ui

chrome/browser/ui/libgtk2ui/g_object_destructor_filo.h

-// Copyright (c) 2012 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_G_OBJECT_DESTRUCTOR_FILO_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_G_OBJECT_DESTRUCTOR_FILO_H_
-
-#include <glib.h>
-#include <list>
-#include <map>
-
-#include "base/basictypes.h"
-
-namespace base {
-template <typename T> struct DefaultSingletonTraits;
-}
-
-typedef struct _GObject GObject;
-
-namespace libgtk2ui {
-
-// This class hooks calls to g_object_weak_ref()/unref() and executes them in
-// FILO order. This is important if there are several hooks to the single object
-// (set up at different levels of class hierarchy) and the lowest hook (set up
-// first) is deleting self - it must be called last (among hooks for the given
-// object). Unfortunately Glib does not provide this guarantee.
-//
-// Use it as follows:
-//
-// static void OnDestroyedThunk(gpointer data, GObject *where_the_object_was) {
-//   reinterpret_cast<MyClass*>(data)->OnDestroyed(where_the_object_was);
-// }
-// void MyClass::OnDestroyed(GObject *where_the_object_was) {
-//   destroyed_ = true;
-//   delete this;
-// }
-// MyClass::Init() {
-//   ...
-//   ui::GObjectDestructorFILO::GetInstance()->Connect(
-//       G_OBJECT(my_widget), &OnDestroyedThunk, this);
-// }
-// MyClass::~MyClass() {
-//   if (!destroyed_) {
-//     ui::GObjectDestructorFILO::GetInstance()->Disconnect(
-//         G_OBJECT(my_widget), &OnDestroyedThunk, this);
-//   }
-// }
-//
-// TODO(glotov): Probably worth adding ScopedGObjectDtor<T>.
-//
-// This class is a singleton. Not thread safe. Must be called within UI thread.
-class GObjectDestructorFILO {
- public:
-  typedef void (*DestructorHook)(void* context, GObject* where_the_object_was);
-
-  static GObjectDestructorFILO* GetInstance();
-  void Connect(GObject* object, DestructorHook callback, void* context);
-  void Disconnect(GObject* object, DestructorHook callback, void* context);
-
- private:
-  struct Hook {
-    Hook(GObject* o, DestructorHook cb, void* ctx)
-        : object(o), callback(cb), context(ctx) {
-    }
-    bool equal(GObject* o, DestructorHook cb, void* ctx) const {
-      return object == o && callback == cb && context == ctx;
-    }
-    GObject* object;
-    DestructorHook callback;
-    void* context;
-  };
-  typedef std::list<Hook> HandlerList;
-  typedef std::map<GObject*, HandlerList> HandlerMap;
-
-  GObjectDestructorFILO();
-  ~GObjectDestructorFILO();
-  friend struct base::DefaultSingletonTraits<GObjectDestructorFILO>;
-
-  void WeakNotify(GObject* where_the_object_was);
-  static void WeakNotifyThunk(gpointer data, GObject* where_the_object_was) {
-    reinterpret_cast<GObjectDestructorFILO*>(data)->WeakNotify(
-        where_the_object_was);
-  }
-
-  HandlerMap handler_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(GObjectDestructorFILO);
-};
-
-}  // namespace libgtk2ui
-
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_G_OBJECT_DESTRUCTOR_FILO_H_