- make bbb-apps compile

...org/bigbluebutton/conference/service/chat/ChatBridge.java

...rg/bigbluebutton/conference/service/chat/ChatService.java

...button/conference/service/messaging/MessagingService.java

...ference/service/participants/ParticipantsApplication.java

...n/conference/service/participants/ParticipantsBridge.java

.../conference/service/participants/ParticipantsHandler.java

.../conference/service/participants/ParticipantsService.java

.../conference/service/presentation/PresentationService.java

...utton/conference/service/whiteboard/WhiteboardBridge.java

...tton/conference/service/whiteboard/WhiteboardService.java