Introduce WebRequestEventRouterDelegate.

extensions/browser/api/web_request/extra_request_params.cc

+// Copyright (c) 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 "extensions/browser/api/web_request/extra_request_params.h"
+
+ExtraRequestParams::ExtraRequestParams() {
+}
+
+ExtraRequestParams::ExtraRequestParams(const ExtraRequestParams& params) {
+}
+
+ExtraRequestParams::~ExtraRequestParams() {
+}
+
+bool ExtraRequestParams::OnInitFromValueCheck(
+    const base::DictionaryValue& value) {
+  return false;
+}
+
+bool ExtraRequestParams::OnGetMatchingListenersImplCheck(
+    net::URLRequest* request)
+  const {
+  return false;
+}