Revert 201955 "Allow multiple base::MessagePumpForUI instances t..."

trunk/src/base/win/message_window.h

-// Copyright 2013 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 BASE_WIN_MESSAGE_WINDOW_H_
-#define BASE_WIN_MESSAGE_WINDOW_H_
-
-#include <windows.h>
-
-#include <string>
-
-#include "base/base_export.h"
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/threading/non_thread_safe.h"
-
-namespace base {
-namespace win {
-
-// Implements a message-only window.
-class BASE_EXPORT MessageWindow : base::NonThreadSafe {
- public:
-  // Handles incoming window messages.
-  class BASE_EXPORT Delegate {
-   public:
-    virtual ~Delegate() {}
-
-    virtual bool HandleMessage(HWND hwnd,
-                               UINT message,
-                               WPARAM wparam,
-                               LPARAM lparam,
-                               LRESULT* result) = 0;
-  };
-
-  MessageWindow();
-  ~MessageWindow();
-
-  // Registers the window class and creates the window. The incoming messages
-  // will be handled by |delegate|. |delegate| must outlive |this|.
-  bool Create(Delegate* delegate);
-
-  HWND hwnd() const { return window_; }
-
- private:
-  // Invoked by the OS to process incoming window messages.
-  static LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wparam,
-                                     LPARAM lparam);
-
-  // Atom representing the registered window class.
-  ATOM atom_;
-
-  // MessageWindow class name.
-  std::string class_name_;
-
-  // Instance of the module containing the window procedure.
-  HINSTANCE instance_;
-
-  // Handle of the input window.
-  HWND window_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessageWindow);
-};
-
-}  // namespace win
-}  // namespace base
-
-#endif  // BASE_WIN_MESSAGE_WINDOW_H_