Migrate xml-insecure groovy->java

See #4939.

samples/xml/insecure/spring-security-samples-xml-insecure.gradle

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2002-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 apply plugin: 'io.spring.convention.spring-sample-war'
 
 dependencies {
@@ -7,5 +23,5 @@ dependencies {
 	providedCompile 'javax.servlet:javax.servlet-api'
 	providedCompile 'javax.servlet.jsp:javax.servlet.jsp-api'
 
-	integrationTestCompile gebDependencies
+	integrationTestCompile seleniumDependencies
 }