prune down content_dll change to just the CONTENT_EXPORTS

content/browser/browser_message_filter.h

 // Copyright (c) 2011 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_BROWSER_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_BROWSER_MESSAGE_FILTER_H_
 #pragma once
 
 #include "base/process.h"
 #include "content/browser/browser_thread.h"
+#include "content/common/content_export.h"
 #include "ipc/ipc_channel_proxy.h"
 
 // Base class for message filters in the browser process.  You can receive and
 // send messages on any thread.
-class BrowserMessageFilter : public IPC::ChannelProxy::MessageFilter,
-                             public IPC::Message::Sender {
+class CONTENT_EXPORT BrowserMessageFilter :
+    public IPC::ChannelProxy::MessageFilter,
+    public IPC::Message::Sender {
  public:
   BrowserMessageFilter();
   virtual ~BrowserMessageFilter();
 
   // IPC::ChannelProxy::MessageFilter methods.  If you override them, make sure
   // to call them as well.  These are always called on the IO thread.
   virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
   virtual void OnChannelClosing() OVERRIDE;
   virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
   // DON'T OVERRIDE THIS!  Override the other version below.
@@ skipping 33 matching lines @@
 
  private:
   // Dispatches a message to the derived class.
   bool DispatchMessage(const IPC::Message& message);
 
   IPC::Channel* channel_;
   base::ProcessHandle peer_handle_;
 };
 
 #endif  // CONTENT_BROWSER_BROWSER_MESSAGE_FILTER_H_