Cleanup remaining class/struct fwd declarations

google_apis/gcm/engine/connection_handler_impl.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_IMPL_H_
 #define GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_IMPL_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "google_apis/gcm/engine/connection_handler.h"
 
 namespace mcs_proto {
 class LoginRequest;
 }  // namespace mcs_proto
 
 namespace gcm {
 
+class SocketInputStream;
+class SocketOutputStream;
+
 class GCM_EXPORT ConnectionHandlerImpl : public ConnectionHandler {
  public:
   // |read_callback| will be invoked with the contents of any received protobuf
   // message.
   // |write_callback| will be invoked anytime a message has been successfully
   // sent. Note: this just means the data was sent to the wire, not that the
   // other end received it.
   // |connection_callback| will be invoked with any fatal read/write errors
   // encountered.
   ConnectionHandlerImpl(
@@ skipping 91 matching lines @@
   std::vector<uint8_t> payload_input_buffer_;
 
   base::WeakPtrFactory<ConnectionHandlerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectionHandlerImpl);
 };
 
 }  // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_IMPL_H_