Deleted OS_WIN and all Windows specific files from base.

base/win/object_watcher.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 BASE_WIN_OBJECT_WATCHER_H_
-#define BASE_WIN_OBJECT_WATCHER_H_
-
-#include <windows.h>
-
-#include "base/base_export.h"
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-#include "base/message_loop/message_loop.h"
-
-namespace base {
-namespace win {
-
-// A class that provides a means to asynchronously wait for a Windows object to
-// become signaled.  It is an abstraction around RegisterWaitForSingleObject
-// that provides a notification callback, OnObjectSignaled, that runs back on
-// the origin thread (i.e., the thread that called StartWatching).
-//
-// This class acts like a smart pointer such that when it goes out-of-scope,
-// UnregisterWaitEx is automatically called, and any in-flight notification is
-// suppressed.
-//
-// Typical usage:
-//
-//   class MyClass : public base::ObjectWatcher::Delegate {
-//    public:
-//     void DoStuffWhenSignaled(HANDLE object) {
-//       watcher_.StartWatching(object, this);
-//     }
-//     virtual void OnObjectSignaled(HANDLE object) {
-//       // OK, time to do stuff!
-//     }
-//    private:
-//     base::ObjectWatcher watcher_;
-//   };
-//
-// In the above example, MyClass wants to "do stuff" when object becomes
-// signaled.  ObjectWatcher makes this task easy.  When MyClass goes out of
-// scope, the watcher_ will be destroyed, and there is no need to worry about
-// OnObjectSignaled being called on a deleted MyClass pointer.  Easy!
-// If the object is already signaled before being watched, OnObjectSignaled is
-// still called after (but not necessarily immediately after) watch is started.
-//
-class BASE_EXPORT ObjectWatcher : public MessageLoop::DestructionObserver {
- public:
-  class BASE_EXPORT Delegate {
-   public:
-    virtual ~Delegate() {}
-    // Called from the MessageLoop when a signaled object is detected.  To
-    // continue watching the object, StartWatching must be called again.
-    virtual void OnObjectSignaled(HANDLE object) = 0;
-  };
-
-  ObjectWatcher();
-  ~ObjectWatcher() override;
-
-  // When the object is signaled, the given delegate is notified on the thread
-  // where StartWatching is called.  The ObjectWatcher is not responsible for
-  // deleting the delegate.
-  //
-  // Returns true if the watch was started.  Otherwise, false is returned.
-  //
-  bool StartWatching(HANDLE object, Delegate* delegate);
-
-  // Stops watching.  Does nothing if the watch has already completed.  If the
-  // watch is still active, then it is canceled, and the associated delegate is
-  // not notified.
-  //
-  // Returns true if the watch was canceled.  Otherwise, false is returned.
-  //
-  bool StopWatching();
-
-  // Returns true if currently watching an object.
-  bool IsWatching() const;
-
-  // Returns the handle of the object being watched.
-  HANDLE GetWatchedObject() const;
-
- private:
-  // Called on a background thread when done waiting.
-  static void CALLBACK DoneWaiting(void* param, BOOLEAN timed_out);
-
-  void Signal(Delegate* delegate);
-
-  // MessageLoop::DestructionObserver implementation:
-  void WillDestroyCurrentMessageLoop() override;
-
-  // Internal state.
-  Closure callback_;
-  HANDLE object_;             // The object being watched
-  HANDLE wait_object_;        // Returned by RegisterWaitForSingleObject
-  MessageLoop* origin_loop_;  // Used to get back to the origin thread
-
-  WeakPtrFactory<ObjectWatcher> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ObjectWatcher);
-};
-
-}  // namespace win
-}  // namespace base
-
-#endif  // BASE_WIN_OBJECT_WATCHER_H_