Update mtime of directory when containee changed.

webkit/fileapi/obfuscated_file_util.h

Index: webkit/fileapi/obfuscated_file_util.h
diff --git a/webkit/fileapi/obfuscated_file_util.h b/webkit/fileapi/obfuscated_file_util.h
index c814b53d861e58e6c230f1d59fc3c12a6058c5cf..aaef51f25fb77502abcac32d5c11ddb523394197 100644
--- a/webkit/fileapi/obfuscated_file_util.h
+++ b/webkit/fileapi/obfuscated_file_util.h
@@ -42,9 +42,6 @@ class FileSystemOperationContext;
 // SandboxMountPointProvider [and the task it uses to drop the reference] and
 // SandboxMountPointProvider::GetFileSystemRootPathTask.  Without that last one,
 // we wouldn't need ref counting.
-//
-// TODO(ericu): We don't ever update directory mtimes; which operations should
-// do that?
 class ObfuscatedFileUtil : public FileSystemFileUtil,
     public base::RefCountedThreadSafe<ObfuscatedFileUtil> {
  public: