content: Cleanup class/struct forward declarations

content/common/service_manager/child_connection.h

 // Copyright 2016 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 CONTENT_COMMON_SERVICE_MANAGER_CHILD_CONNECTION_H_
 #define CONTENT_COMMON_SERVICE_MANAGER_CHILD_CONNECTION_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process_handle.h"
 #include "base/sequenced_task_runner.h"
 #include "content/common/content_export.h"
 #include "services/service_manager/public/cpp/identity.h"
 #include "services/service_manager/public/cpp/interface_provider.h"
 #include "services/service_manager/public/interfaces/connector.mojom.h"
 
 namespace service_manager {
-class Connection;
 class Connector;
 }
 
 namespace content {
 
 // Helper class to establish a connection between the Service Manager and a
 // single child process. Process hosts can use this when launching new processes
 // which should be registered with the service manager.
 class CONTENT_EXPORT ChildConnection {
  public:
@@ skipping 36 matching lines @@
   service_manager::InterfaceProvider remote_interfaces_;
 
   base::WeakPtrFactory<ChildConnection> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildConnection);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SERVICE_MANAGER_CHILD_CONNECTION_H_