Clean up HID backend and API.

device/hid/hid_service_unittest.cc

Index: device/hid/hid_service_unittest.cc
diff --git a/device/hid/hid_service_unittest.cc b/device/hid/hid_service_unittest.cc
index 1fa1c0a9bd009b18452fc168ae7160090357968f..623bf2fd42c45d72a4fb95d4a12c3c6eb220af60 100644
--- a/device/hid/hid_service_unittest.cc
+++ b/device/hid/hid_service_unittest.cc
@@ -1,16 +1,11 @@
-// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include <string>
 #include <vector>
 
-#include "base/bind.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
-#include "device/hid/hid_connection.h"
 #include "device/hid/hid_service.h"
-#include "net/base/io_buffer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace device {