Deleted OS_WIN and all Windows specific files from base.

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 "base/base_export.h"
-#include "base/basictypes.h"
-#include "base/callback.h"
-#include "base/compiler_specific.h"
-#include "base/strings/string16.h"
-#include "base/threading/non_thread_safe.h"
-
-namespace base {
-namespace win {
-
-// Implements a message-only window.
-class BASE_EXPORT MessageWindow : public base::NonThreadSafe {
- public:
-  // Used to register a process-wide message window class.
-  class WindowClass;
-
-  // Implement this callback to handle messages received by the message window.
-  // If the callback returns |false|, the first four parameters are passed to
-  // DefWindowProc(). Otherwise, |*result| is returned by the window procedure.
-  typedef base::Callback<bool(UINT message,
-                              WPARAM wparam,
-                              LPARAM lparam,
-                              LRESULT* result)> MessageCallback;
-
-  MessageWindow();
-  ~MessageWindow();
-
-  // Creates a message-only window. The incoming messages will be passed by
-  // |message_callback|. |message_callback| must outlive |this|.
-  bool Create(const MessageCallback& message_callback);
-
-  // Same as Create() but assigns the name to the created window.
-  bool CreateNamed(const MessageCallback& message_callback,
-                   const string16& window_name);
-
-  HWND hwnd() const { return window_; }
-
-  // Retrieves a handle of the first message-only window with matching
-  // |window_name|.
-  static HWND FindWindow(const string16& window_name);
-
- private:
-  // Give |WindowClass| access to WindowProc().
-  friend class WindowClass;
-
-  // Contains the actual window creation code.
-  bool DoCreate(const MessageCallback& message_callback,
-                const wchar_t* window_name);
-
-  // Invoked by the OS to process incoming window messages.
-  static LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wparam,
-                                     LPARAM lparam);
-
-  // Invoked to handle messages received by the window.
-  MessageCallback message_callback_;
-
-  // Handle of the input window.
-  HWND window_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessageWindow);
-};
-
-}  // namespace win
-}  // namespace base
-
-#endif  // BASE_WIN_MESSAGE_WINDOW_H_