blimp: Cleanup class/struct forward declarations

blimp/net/blimp_message_output_buffer.h

 // Copyright 2015 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 BLIMP_NET_BLIMP_MESSAGE_OUTPUT_BUFFER_H_
 #define BLIMP_NET_BLIMP_MESSAGE_OUTPUT_BUFFER_H_
 
 #include <stdint.h>
 
 #include <list>
 #include <queue>
 #include <utility>
 
 #include "base/macros.h"
 #include "blimp/net/blimp_message_checkpoint_observer.h"
 #include "blimp/net/blimp_message_processor.h"
 #include "blimp/net/blimp_net_export.h"
 #include "net/base/completion_callback.h"
 
 namespace blimp {
 
-class BlimpConnection;
-
 // Provides a FIFO buffer for reliable, ordered message delivery.
 // Messages are retained for redelivery until they are acknowledged by the
 // receiving end (via BlimpMessageCheckpointObserver).
 // Messages can be paired with callbacks that are invoked on successful
 // message acknowledgment.
 // (Redelivery will be used in a future CL to implement Fast Recovery
 // of dropped connections.)
 // BlimpMessageOutputBuffer is created on the UI thread, and then used and
 // destroyed on the IO thread.
 class BLIMP_NET_EXPORT BlimpMessageOutputBuffer
@@ skipping 60 matching lines @@
   // The messages in |ack_buffer_| are contiguous with the messages in
   // |write_buffer_|.
   MessageBuffer ack_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpMessageOutputBuffer);
 };
 
 }  // namespace blimp
 
 #endif  // BLIMP_NET_BLIMP_MESSAGE_OUTPUT_BUFFER_H_