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

Broke Mac tests:

http://build.chromium.org/p/chromium.mac/buildstatus?builder=Mac10.6%20Tests%20%281%29&number=52768
http://build.chromium.org/p/chromium.mac/buildstatus?builder=Mac10.6%20Tests%20%282%29&number=52019
http://build.chromium.org/p/chromium.mac/buildstatus?builder=Mac%2010.6%20Tests%20%28dbg%29%283%29&number=50243
http://build.chromium.org/p/chromium.mac/buildstatus?builder=Mac%2010.6%20Tests%20%28dbg%29%284%29&number=41693


> Use FSEvents for recursive file watch on Mac
> 
> Brings back the old FSEvents code, changing it to support recursive watches only, and use dispatch queues instead of using the CFRunLoop from the UI thread.
> 
> BUG=144491
> 
> Review URL: https://codereview.chromium.org/283423003

TBR=vandebo@chromium.org

Review URL: https://codereview.chromium.org/316853003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274757 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 1595e8383f59e8c348d97c918df3ffdacaa8d987
diff --git a/base/files/file_path_watcher.h b/base/files/file_path_watcher.h
index 229254c..3c1941f 100644
--- a/base/files/file_path_watcher.h
+++ b/base/files/file_path_watcher.h
@@ -93,7 +93,7 @@
   // true, to watch |path| and its children. The callback will be invoked on
   // the same loop. Returns true on success.
   //
-  // Recursive watch is not supported on all platforms and file systems.
+  // NOTE: Recursive watch is not supported on all platforms and file systems.
   // Watch() will return false in the case of failure.
   bool Watch(const FilePath& path, bool recursive, const Callback& callback);