Update Background Fetch IDLs following spec changes

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchRequest.cpp

Index: third_party/WebKit/Source/modules/background_fetch/BackgroundFetchRequest.cpp
diff --git a/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchRequest.cpp b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchRequest.cpp
deleted file mode 100644
index 27d160398aa5a9740f984875363be7f6fb0a0ada..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchRequest.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2017 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 "modules/background_fetch/BackgroundFetchRequest.h"
-
-#include "modules/fetch/Request.h"
-
-namespace blink {
-
-BackgroundFetchRequest::BackgroundFetchRequest(Request* request)
-    : m_request(request) {}
-
-Request* BackgroundFetchRequest::request() const {
-  return m_request;
-}
-
-DEFINE_TRACE(BackgroundFetchRequest) {
-  visitor->trace(m_request);
-}
-
-}  // namespace blink