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

trunk/src/base/files/file_path_watcher.h

Index: trunk/src/base/files/file_path_watcher.h
===================================================================
--- trunk/src/base/files/file_path_watcher.h	(revision 274756)
+++ trunk/src/base/files/file_path_watcher.h	(working copy)
@@ -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);