chore(syntax): Remove extern crate imports where not needed

examples/drive_example/src/main.rs

@@ -6,11 +6,6 @@
 //!
 //! Copyright (c) 2016 Google, Inc. (Lewin Bormann <lbo@spheniscida.de>)
 
-extern crate hyper;
-extern crate hyper_native_tls;
-extern crate yup_oauth2;
-extern crate google_drive3;
-
 use std::path::Path;
 
 use hyper::net::HttpsConnector;

examples/service_account/src/main.rs

@@ -24,9 +24,6 @@
 //!
 //! Copyright (c) 2016 Google, Inc. (Lewin Bormann <lbo@spheniscida.de>)
 //!
-extern crate base64;
-extern crate hyper;
-extern crate hyper_native_tls;
 
 use std::env;
 use std::time;

src/installed.rs

@@ -2,9 +2,6 @@
 //
 // Refer to the project root for licensing information.
 //
-extern crate serde_json;
-extern crate url;
-
 use std::convert::AsRef;
 use std::error::Error;
 use std::io;

src/lib.rs

@@ -65,24 +65,9 @@
 #[macro_use]
 extern crate serde_derive;
 
-extern crate serde;
-extern crate serde_json;
-
-extern crate base64;
-extern crate chrono;
-extern crate hyper;
-extern crate hyper_tls;
-
-#[cfg(test)]
-extern crate log;
 #[cfg(test)]
 #[macro_use]
 extern crate yup_hyper_mock as hyper_mock;
-extern crate itertools;
-#[cfg(test)]
-extern crate tokio;
-extern crate tokio_threadpool;
-extern crate url;
 
 mod authenticator;
 mod authenticator_delegate;

src/storage.rs

@@ -3,8 +3,6 @@
 // See project root for licensing information.
 //
 
-extern crate serde_json;
-
 use std::collections::hash_map::DefaultHasher;
 use std::collections::HashMap;
 use std::error::Error;