Remove unused import.

web/src/main/java/org/springframework/security/web/ExceptionTranslationFilter.java

@@ -23,7 +23,6 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 import org.springframework.beans.factory.InitializingBean;
-import org.springframework.core.NestedRuntimeException;
 import org.springframework.security.access.AccessDeniedException;
 import org.springframework.security.authentication.AuthenticationTrustResolver;
 import org.springframework.security.authentication.AuthenticationTrustResolverImpl;