Cleanup remaining class/struct fwd declarations

google_apis/gcm/engine/connection_handler.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 GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_H_
 #define GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "google_apis/gcm/base/gcm_export.h"
 
 namespace net{
 class StreamSocket;
 }  // namespace net
 
 namespace google {
 namespace protobuf {
 class MessageLite;
 }  // namespace protobuf
 }  // namepsace google
 
 namespace mcs_proto {
 class LoginRequest;
 }
 
 namespace gcm {
 
-class SocketInputStream;
-class SocketOutputStream;
-
 // Handles performing the protocol handshake and sending/receiving protobuf
 // messages. Note that no retrying or queueing is enforced at this layer.
 // Once a connection error is encountered, the ConnectionHandler will disconnect
 // the socket and must be reinitialized with a new StreamSocket before
 // messages can be sent/received again.
 class GCM_EXPORT ConnectionHandler {
  public:
   typedef base::Callback<void(std::unique_ptr<google::protobuf::MessageLite>)>
       ProtoReceivedCallback;
   typedef base::Closure ProtoSentCallback;
@@ skipping 18 matching lines @@
   // in flight.
   virtual bool CanSendMessage() const = 0;
 
   // Send an MCS protobuf message. CanSendMessage() must be true.
   virtual void SendMessage(const google::protobuf::MessageLite& message) = 0;
 };
 
 }  // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_H_