Add @RunWith(JUnit4.class) to ArchiveServletTest.

Change-Id: Ia2440b53ffe9cee645246dbc04ee31e64f1f2190

javatests/com/google/gitiles/ArchiveServletTest.java

diff --git a/javatests/com/google/gitiles/ArchiveServletTest.java b/javatests/com/google/gitiles/ArchiveServletTest.java
index 89db8c2..8d7bc4c 100644
--- a/javatests/com/google/gitiles/ArchiveServletTest.java
+++ b/javatests/com/google/gitiles/ArchiveServletTest.java
@@ -19,7 +19,10 @@
 
 import com.google.common.net.HttpHeaders;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
+@RunWith(JUnit4.class)
 public class ArchiveServletTest extends ServletTest {
 
   @Test