Tidy up and finish reference table dumping.

Change-Id: I9f0d214e27a75d373e3144b738f1e3da51bbc0ca
diff --git a/src/indirect_reference_table_test.cc b/src/indirect_reference_table_test.cc
index cea4afd..387a2cd 100644
--- a/src/indirect_reference_table_test.cc
+++ b/src/indirect_reference_table_test.cc
@@ -52,7 +52,7 @@
   IndirectRef iref2 = irt.Add(cookie, obj2);
   EXPECT_TRUE(iref2 != NULL);
 
-  irt.Dump();
+  irt.Dump(LOG(DEBUG));
 
   EXPECT_EQ(obj0, irt.Get(iref0));
   EXPECT_EQ(obj1, irt.Get(iref1));