Remove base::mac::LibDispatchTaskRunner and migrate its sole client to plain libdispatch.

base/files/file_path_watcher_fsevents.h

 // 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.
 
 #ifndef BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
 #define BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
 
 #include <CoreServices/CoreServices.h>
 #include <stddef.h>
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/files/file_path_watcher.h"
+#include "base/mac/scoped_dispatch_object.h"
 #include "base/macros.h"
 
 namespace base {
 
 // Mac-specific file watcher implementation based on FSEvents.
 // There are trade-offs between the FSEvents implementation and a kqueue
 // implementation. The biggest issues are that FSEvents on 10.6 sometimes drops
 // events and kqueue does not trigger for modifications to a file in a watched
 // directory. See file_path_watcher_mac.cc for the code that decides when to
 // use which one.
@@ skipping 44 matching lines @@
   // Destroy the event stream.
   void DestroyEventStream();
 
   // Start watching the FSEventStream.
   void StartEventStream(FSEventStreamEventId start_event, const FilePath& path);
 
   // Callback to notify upon changes.
   // (Only accessed from the message_loop() thread.)
   FilePathWatcher::Callback callback_;
 
+  // The dispatch queue on which the the event stream is scheduled.
+  ScopedDispatchObject<dispatch_queue_t> queue_;
+
   // Target path to watch (passed to callback).
-  // (Only accessed from the libdispatch thread.)
+  // (Only accessed from the libdispatch queue.)
   FilePath target_;
 
   // Target path with all symbolic links resolved.
-  // (Only accessed from the libdispatch thread.)
+  // (Only accessed from the libdispatch queue.)
   FilePath resolved_target_;
 
   // Backend stream we receive event callbacks from (strong reference).
-  // (Only accessed from the libdispatch thread.)
+  // (Only accessed from the libdispatch queue.)
   FSEventStreamRef fsevent_stream_;
 
   DISALLOW_COPY_AND_ASSIGN(FilePathWatcherFSEvents);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_