Remove unused PresentationServiceImpl message code

content/browser/presentation/presentation_service_impl.h

Index: content/browser/presentation/presentation_service_impl.h
diff --git a/content/browser/presentation/presentation_service_impl.h b/content/browser/presentation/presentation_service_impl.h
index 240fbd74af7f9eef8bf303b0349f6c21b4ed4ff9..5ba4c47a346e7f938065772dc096b8b7a8a4df11 100644
--- a/content/browser/presentation/presentation_service_impl.h
+++ b/content/browser/presentation/presentation_service_impl.h
@@ -103,7 +103,6 @@ class CONTENT_EXPORT PresentationServiceImpl
 
   using ConnectionMessagesCallback =
       base::Callback<void(std::vector<blink::mojom::ConnectionMessagePtr>)>;
-  using SendConnectionMessageCallback = base::Callback<void(bool)>;
 
   // Listener implementation owned by PresentationServiceImpl. An instance of
   // this is created when PresentationRequest.getAvailability() is resolved.
@@ -168,10 +167,6 @@ class CONTENT_EXPORT PresentationServiceImpl
   void JoinSession(const std::vector<GURL>& presentation_urls,
                    const base::Optional<std::string>& presentation_id,
                    const NewSessionCallback& callback) override;
-  void SendConnectionMessage(
-      const PresentationSessionInfo& session_info,
-      blink::mojom::ConnectionMessagePtr connection_message,
-      const SendConnectionMessageCallback& callback) override;
   void CloseConnection(const GURL& presentation_url,
                        const std::string& presentation_id) override;
   void Terminate(const GURL& presentation_url,
@@ -229,7 +224,6 @@ class CONTENT_EXPORT PresentationServiceImpl
   void OnJoinSessionError(
       int request_session_id,
       const PresentationError& error);
-  void OnSendMessageCallback(bool sent);
 
   // Calls to |delegate_| to start listening for state changes for |connection|.
   // State changes will be returned via |OnConnectionStateChanged|.
@@ -303,11 +297,6 @@ class CONTENT_EXPORT PresentationServiceImpl
   // The binding is removed when binding_ is cleared or goes out of scope.
   std::unique_ptr<mojo::Binding<blink::mojom::PresentationService>> binding_;
 
-  // There can be only one send message request at a time.
-  std::unique_ptr<SendConnectionMessageCallback> send_message_callback_;
-
-  std::unique_ptr<ConnectionMessagesCallback> on_connection_messages_callback_;
-
   // ID of the RenderFrameHost this object is associated with.
   int render_process_id_;
   int render_frame_id_;