Add SharedWorkerServiceImpl::CheckWorkerDependency().

content/browser/message_port_message_filter.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_MESSAGE_PORT_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_MESSAGE_PORT_MESSAGE_FILTER_H_
 
 #include "base/callback.h"
+#include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
 
 namespace content {
 
 // Filter for MessagePort related IPC messages (creating and destroying a
 // MessagePort, sending a message via a MessagePort etc).
-class MessagePortMessageFilter : public BrowserMessageFilter {
+class CONTENT_EXPORT MessagePortMessageFilter : public BrowserMessageFilter {
  public:
   typedef base::Callback<int(void)> NextRoutingIDCallback;
 
   // |next_routing_id| is owned by this object.  It can be used up until
   // OnChannelClosing.
   explicit MessagePortMessageFilter(const NextRoutingIDCallback& callback);
 
   // BrowserMessageFilter implementation.
   virtual void OnChannelClosing() OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
   virtual void OnDestruct() const OVERRIDE;
 
   int GetNextRoutingID();
 
+ protected:
+  // This is protected, so we can define sub classes for testing.
+  virtual ~MessagePortMessageFilter();
+
  private:
   friend class BrowserThread;
   friend class base::DeleteHelper<MessagePortMessageFilter>;
 
-  virtual ~MessagePortMessageFilter();
-
   // Message handlers.
   void OnCreateMessagePort(int* route_id, int* message_port_id);
 
   // This is guaranteed to be valid until OnChannelClosing is invoked, and it's
   // not used after.
   NextRoutingIDCallback next_routing_id_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(MessagePortMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WORKER_MESSAGE_FILTER_H_