Revert 274735 "Use FSEvents for recursive file watch on Mac"

trunk/src/base/files/file_path_watcher_mac.cc

-// Copyright 2014 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.
-
-#include "base/files/file_path_watcher.h"
-#include "base/files/file_path_watcher_kqueue.h"
-
-#if !defined(OS_IOS)
-#include "base/files/file_path_watcher_fsevents.h"
-#include "base/mac/mac_util.h"
-#endif
-
-namespace base {
-
-namespace {
-
-class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate {
- public:
-  virtual bool Watch(const FilePath& path,
-                     bool recursive,
-                     const FilePathWatcher::Callback& callback) OVERRIDE {
-    // Use kqueue for non-recursive watches and FSEvents for recursive ones.
-    DCHECK(!impl_.get());
-    if (recursive) {
-      // FSEvents isn't available on iOS and is broken on OSX 10.6 and earlier.
-      // See http://crbug.com/54822#c31
-#if !defined(OS_IOS)
-      if (mac::IsOSLionOrLater())
-        impl_ = new FilePathWatcherFSEvents();
-#endif  // OS_IOS
-
-      if (!impl_)
-        return false;
-    } else {
-      impl_ = new FilePathWatcherKQueue();
-    }
-    return impl_->Watch(path, recursive, callback);
-  }
-
-  virtual void Cancel() OVERRIDE {
-    if (impl_)
-      impl_->Cancel();
-    set_cancelled();
-  }
-
-  virtual void CancelOnMessageLoopThread() OVERRIDE {
-    if (impl_)
-      impl_->Cancel();
-    set_cancelled();
-  }
-
- protected:
-  virtual ~FilePathWatcherImpl() {}
-
-  scoped_refptr<PlatformDelegate> impl_;
-};
-
-}  // namespace
-
-FilePathWatcher::FilePathWatcher() {
-  impl_ = new FilePathWatcherImpl();
-}
-
-}  // namespace base