components: Cleanup class/struct fwd declarations

components/sync/engine_impl/net/server_connection_manager.h

 // Copyright 2012 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 COMPONENTS_SYNC_ENGINE_IMPL_NET_SERVER_CONNECTION_MANAGER_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_NET_SERVER_CONNECTION_MANAGER_H_
 
 #include <stdint.h>
 
 #include <iosfwd>
 #include <memory>
 #include <string>
 
 #include "base/atomicops.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/strings/string_util.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/threading/thread_checker.h"
 #include "components/sync/base/cancelation_observer.h"
 #include "components/sync/syncable/syncable_id.h"
 
-namespace sync_pb {
-class ClientToServerMessage;
-}
-
 namespace syncer {
 
 class CancelationSignal;
 
-namespace syncable {
-class Directory;
-}
-
 static const int32_t kUnsetResponseCode = -1;
 static const int32_t kUnsetContentLength = -1;
 static const int32_t kUnsetPayloadLength = -1;
 
 // HttpResponse gathers the relevant output properties of an HTTP request.
 // Depending on the value of the server_status code, response_code, and
 // content_length may not be valid.
 struct HttpResponse {
   enum ServerConnectionCode {
     // For uninitialized state.
@@ skipping 254 matching lines @@
   bool signal_handler_registered_;
 
   DISALLOW_COPY_AND_ASSIGN(ServerConnectionManager);
 };
 
 std::ostream& operator<<(std::ostream& s, const struct HttpResponse& hr);
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_NET_SERVER_CONNECTION_MANAGER_H_