Creates a new directory. On Windows if |prefix| is provided the new
directory name is in the format of "prefixyyyy". Returns true (1) on success
and sets |new_temp_path| to the full path of the directory that was created.
The directory is only readable by the current user. Calling this function on
the browser process UI or IO threads is not allowed.
Creates a new directory. On Windows if |prefix| is provided the new directory name is in the format of "prefixyyyy". Returns true (1) on success and sets |new_temp_path| to the full path of the directory that was created. The directory is only readable by the current user. Calling this function on the browser process UI or IO threads is not allowed.