message: Fix warnings in current master.
diff: @@ -5,7 +5,7 @@ extern crate log;
  extern crate android_logger;
  use self::env_logger::Builder;
  -use self::log::{Record, LevelFilter, Level};
  +use self::log::LevelFilter;
  use std::env;
  use std::io::Write;
  use std::sync::{Once, ONCE_INIT};
  