Delete unused imports in spring-websocket module

spring-websocket/src/main/java/org/springframework/web/socket/config/annotation/WebSocketMessageBrokerConfigurationSupport.java

@@ -23,11 +23,9 @@ import org.springframework.messaging.simp.broker.AbstractBrokerMessageHandler;
 import org.springframework.messaging.simp.config.AbstractMessageBrokerConfiguration;
 import org.springframework.messaging.simp.stomp.StompBrokerRelayMessageHandler;
 import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
-import org.springframework.util.Assert;
 import org.springframework.web.servlet.HandlerMapping;
 import org.springframework.web.socket.WebSocketHandler;
 import org.springframework.web.socket.config.WebSocketMessageBrokerStats;
-import org.springframework.web.socket.handler.WebSocketHandlerDecorator;
 import org.springframework.web.socket.handler.WebSocketHandlerDecoratorFactory;
 import org.springframework.web.socket.messaging.SubProtocolWebSocketHandler;
 

spring-websocket/src/test/java/org/springframework/web/socket/config/annotation/WebMvcStompWebSocketEndpointRegistrationTests.java

@@ -39,7 +39,6 @@ import org.springframework.web.socket.sockjs.transport.handler.DefaultSockJsServ
 import org.springframework.web.socket.sockjs.transport.handler.WebSocketTransportHandler;
 
 import static org.junit.Assert.*;
-import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.mock;
 
 /**

spring-websocket/src/test/java/org/springframework/web/socket/config/annotation/WebSocketMessageBrokerConfigurationSupportTests.java

@@ -56,7 +56,6 @@ import org.springframework.web.socket.messaging.SubProtocolWebSocketHandler;
 import org.springframework.web.socket.server.support.WebSocketHttpRequestHandler;
 
 import static org.junit.Assert.*;
-import static org.junit.Assert.assertEquals;
 
 /**
  * Test fixture for

spring-websocket/src/test/java/org/springframework/web/socket/sockjs/client/AbstractSockJsIntegrationTests.java

@@ -39,7 +39,6 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.junit.After;
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TestName;