Removing a stray junit dep missed in r9870.

Continuing the old code review thread:
http://gwt-code-reviews.appspot.com/1383804

Review by: scottb@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9902 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/dev/build.xml b/dev/build.xml
index 4013b79..6782911 100755
--- a/dev/build.xml
+++ b/dev/build.xml
@@ -213,7 +213,6 @@
           <pathelement location="${gwt.tools.lib}/apache/ant-1.6.5.jar" />
           <pathelement location="${gwt.tools.lib}/eclipse/jdt-3.4.2.jar" />
           <pathelement location="${gwt.tools.lib}/tomcat/commons-collections-3.1.jar" />
-          <pathelement location="${gwt.tools.lib}/junit/junit-4.8.2.jar" />
           <pathelement location="${gwt.tools.lib}/guava/guava-r06/guava-r06-rebased-2.jar" />
       </classpath>
     </gwt.javac>