GitilesFilter: allow injecting custom BlameCache

Change-Id: I3e12e624120de452bbc1ff7598836a5ddf1cd949

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

diff --git a/gitiles-servlet/src/test/java/com/google/gitiles/TestGitilesServlet.java b/gitiles-servlet/src/test/java/com/google/gitiles/TestGitilesServlet.java
index e7079d3..84ddd64 100644
--- a/gitiles-servlet/src/test/java/com/google/gitiles/TestGitilesServlet.java
+++ b/gitiles-servlet/src/test/java/com/google/gitiles/TestGitilesServlet.java
@@ -69,7 +69,7 @@
                 }
                 return repo.getRepository();
               }
-            }, null, null, gitwebRedirect);
+            }, null, null, null, gitwebRedirect);
 
     servlet.init(new ServletConfig() {
       @Override