components: Cleanup class/struct fwd declarations

components/invalidation/impl/sync_invalidation_listener.h

 // Copyright 2014 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.
 //
 // A simple wrapper around invalidation::InvalidationClient that
 // handles all the startup/shutdown details and hookups.
 
 #ifndef COMPONENTS_INVALIDATION_IMPL_SYNC_INVALIDATION_LISTENER_H_
 #define COMPONENTS_INVALIDATION_IMPL_SYNC_INVALIDATION_LISTENER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "components/invalidation/impl/invalidation_state_tracker.h"
 #include "components/invalidation/impl/state_writer.h"
 #include "components/invalidation/impl/sync_system_resources.h"
 #include "components/invalidation/impl/unacked_invalidation_set.h"
 #include "components/invalidation/public/ack_handler.h"
 #include "components/invalidation/public/invalidation_export.h"
 #include "components/invalidation/public/invalidator_state.h"
 #include "google/cacheinvalidation/include/invalidation-listener.h"
 
-namespace buzz {
-class XmppTaskParentInterface;
-}  // namespace buzz
-
-namespace notifier {
-class PushClient;
-}  // namespace notifier
-
 namespace syncer {
 
 class ObjectIdInvalidationMap;
 class RegistrationManager;
 
 // SyncInvalidationListener is not thread-safe and lives on the sync
 // thread.
 class INVALIDATION_EXPORT SyncInvalidationListener
     : public NON_EXPORTED_BASE(invalidation::InvalidationListener),
       public StateWriter,
@@ skipping 137 matching lines @@
   InvalidatorState push_client_state_;
 
   base::WeakPtrFactory<SyncInvalidationListener> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncInvalidationListener);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_INVALIDATION_IMPL_SYNC_INVALIDATION_LISTENER_H_