Remove KeyboardDevice class.

ui/events/devices/keyboard_device.cc

Index: ui/events/devices/keyboard_device.cc
diff --git a/ui/events/devices/keyboard_device.cc b/ui/events/devices/keyboard_device.cc
deleted file mode 100644
index 9e00340e78952f4165c1ebf016bd4422180f8a74..0000000000000000000000000000000000000000
--- a/ui/events/devices/keyboard_device.cc
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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 "ui/events/devices/keyboard_device.h"
-
-#include <string>
-
-#include "ui/events/devices/input_device.h"
-
-namespace ui {
-
-KeyboardDevice::KeyboardDevice(int id,
-                               InputDeviceType type,
-                               const std::string& name)
-    : InputDevice(id, type, name) {
-}
-
-KeyboardDevice::KeyboardDevice(const InputDevice& input_device)
-    : InputDevice(input_device) {
-}
-
-}  // namespace ui