no need to list transitive dependency.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@1310 71c3de6d-444a-0410-be80-ed276b4c234a

remoting/pom.xml

@@ -80,11 +80,6 @@
   </build>
 
   <dependencies>
-    <dependency>
-      <groupId>backport-util-concurrent</groupId>
-      <artifactId>backport-util-concurrent</artifactId>
-      <version>2.2</version>
-    </dependency>
     <dependency>
       <groupId>net.sf.retrotranslator</groupId>
       <artifactId>retrotranslator-runtime</artifactId>