Remove useless use crate_name; imports.

A `crate_name::foo` path always works in 2018

components/net_traits/image/base.rs

@@ -4,9 +4,7 @@
 
 use ipc_channel::ipc::IpcSharedMemory;
 use piston_image::{DynamicImage, ImageFormat};
-use pixels;
 use std::fmt;
-use webrender_api;
 
 #[derive(Clone, Copy, Debug, Deserialize, Eq, MallocSizeOf, PartialEq, Serialize)]
 pub enum PixelFormat {

components/net_traits/image_cache.rs

@@ -7,7 +7,6 @@ use crate::FetchResponseMsg;
 use ipc_channel::ipc::IpcSender;
 use servo_url::ServoUrl;
 use std::sync::Arc;
-use webrender_api;
 
 // ======================================================================
 // Aux structs and enums.

components/net_traits/tests/whitespace.rs

@@ -2,8 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use net_traits;
-
 #[test]
 fn test_trim_http_whitespace() {
     fn test_trim(in_: &[u8], out: &[u8]) {