Add some empty classes for the embedded SharedWorker.

content/browser/worker_host/shared_worker_instance.cc

+// 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 "content/browser/worker_host/shared_worker_instance.h"
+
+#include "content/browser/worker_host/shared_worker_document_set.h"
+
+namespace content {
+
+SharedWorkerInstance::SharedWorkerInstance(
+    const GURL& url,
+    const base::string16& name,
+    const base::string16& content_security_policy,
+    blink::WebContentSecurityPolicyType security_policy_type,
+    int worker_route_id,
+    ResourceContext* resource_context,
+    const WorkerStoragePartition& partition) {
+}
+
+SharedWorkerInstance::~SharedWorkerInstance() {
+}
+
+
+}  // namespace content