Migrating majority of gamepad from content/browser/ to device/

content/browser/gamepad/gamepad_platform_data_fetcher.cc

-// Copyright (c) 2012 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 "content/browser/gamepad/gamepad_platform_data_fetcher.h"
-
-#include "third_party/WebKit/public/platform/WebGamepads.h"
-
-namespace content {
-
-GamepadDataFetcherEmpty::GamepadDataFetcherEmpty() {
-}
-
-void GamepadDataFetcherEmpty::GetGamepadData(blink::WebGamepads* pads,
-                                             bool devices_changed_hint) {
-  pads->length = 0;
-}
-
-}  // namespace content