[Mac] Remove usage of deprecated FNNotifyByPath().

chrome/browser/download/download_status_updater_mac.mm

 // Copyright 2012 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 "chrome/browser/download/download_status_updater.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 224 matching lines @@
     NSString* download_path =
         base::mac::FilePathToNSString(download->GetTargetFilePath());
     if (download->GetState() == content::DownloadItem::COMPLETE) {
       // Bounce the dock icon.
       [[NSDistributedNotificationCenter defaultCenter]
           postNotificationName:@"com.apple.DownloadFileFinished"
                         object:download_path];
     }
 
     // Notify the Finder.
-    NSString* parent_path = [download_path stringByDeletingLastPathComponent];
-    FNNotifyByPath(
-        reinterpret_cast<const UInt8*>([parent_path fileSystemRepresentation]),
-        kFNDirectoryModifiedMessage,
-        kNilOptions);
+    [[NSWorkspace sharedWorkspace] noteFileSystemChanged:download_path];

[Avi (use Gerrit), 2016/10/04 22:12:29]

-noteFileSystemChanged: has the note:

"Use of this method is discouraged. If you want to track changes to files and
directories, use the FSEvents API described in FSEvents Reference."

Yet I cannot figure out how any of the functions in the FSEvents API would be
applicable.

Huh.

[Robert Sesek, 2016/10/04 22:38:49]

Yes, as far as I know, the only public FSEvents APIs are to observe the event
stream.

   }
 }