Fix 'redundant specification of type' warnings

These new warnings appear when compiling with Java 8.

Change-Id: I053fab3618214b2b86294262277491e0f9f31ba0

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

diff --git a/gitiles-servlet/src/test/java/com/google/gitiles/RevisionParserTest.java b/gitiles-servlet/src/test/java/com/google/gitiles/RevisionParserTest.java
index 43047ed..ed3ed9b 100644
--- a/gitiles-servlet/src/test/java/com/google/gitiles/RevisionParserTest.java
+++ b/gitiles-servlet/src/test/java/com/google/gitiles/RevisionParserTest.java
@@ -42,7 +42,7 @@
   @Before
   public void setUp() throws Exception {
     repo =
-        new TestRepository<DfsRepository>(
+        new TestRepository<>(
             new InMemoryRepository(new DfsRepositoryDescription("test")));
     parser =
         new RevisionParser(