Replace more ObserverList with base::ObserverList.

sync/engine/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 SYNC_ENGINE_NET_SERVER_CONNECTION_MANAGER_H_
 #define SYNC_ENGINE_NET_SERVER_CONNECTION_MANAGER_H_
 
 #include <iosfwd>
 #include <string>
 
@@ skipping 270 matching lines @@
 
   // The paths we post to.
   std::string proto_sync_path_;
 
   // The auth token to use in authenticated requests.
   std::string auth_token_;
 
   // The previous auth token that is invalid now.
   std::string previously_invalidated_token;
 
-  ObserverList<ServerConnectionEventListener> listeners_;
+  base::ObserverList<ServerConnectionEventListener> listeners_;
 
   HttpResponse::ServerConnectionCode server_status_;
 
   base::ThreadChecker thread_checker_;
 
   // Protects all variables below to allow bailing out of active connections.
   base::Lock terminate_connection_lock_;
 
   // If true, we've been told to terminate IO and expect to be destroyed
   // shortly.  No future network requests will be made.
@@ skipping 30 matching lines @@
   bool signal_handler_registered_;
 
   DISALLOW_COPY_AND_ASSIGN(ServerConnectionManager);
 };
 
 std::ostream& operator<<(std::ostream& s, const struct HttpResponse& hr);
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_NET_SERVER_CONNECTION_MANAGER_H_