Update org.eclipse.jgit.junit.TestRepository.getClock() -> getDate()

Change-Id: Ibc84e0be615fe9e9ca7016972da65acf593e83ce

gitiles-servlet/src/test/java/com/google/gitiles/TimeCacheTest.java

diff --git a/gitiles-servlet/src/test/java/com/google/gitiles/TimeCacheTest.java b/gitiles-servlet/src/test/java/com/google/gitiles/TimeCacheTest.java
index bc4e553..7100359 100644
--- a/gitiles-servlet/src/test/java/com/google/gitiles/TimeCacheTest.java
+++ b/gitiles-servlet/src/test/java/com/google/gitiles/TimeCacheTest.java
@@ -55,7 +55,7 @@
         new InMemoryRepository(new DfsRepositoryDescription("test")));
     walk = new RevWalk(repo.getRepository());
     cache = new TimeCache();
-    start = repo.getClock().getTime() / 1000;
+    start = repo.getDate().getTime() / 1000;
   }
 
   private long getTime(ObjectId id) throws IOException {