Fix memory leak in readingListPrivate api test.

components/dom_distiller/core/dom_distiller_test_util.cc

Index: components/dom_distiller/core/dom_distiller_test_util.cc
diff --git a/components/dom_distiller/core/dom_distiller_test_util.cc b/components/dom_distiller/core/dom_distiller_test_util.cc
index 99ed3bc785ef242e1038093f4aeb623192b6ff2a..f9164fd63be81574635264571fabe6b949ad1e90 100644
--- a/components/dom_distiller/core/dom_distiller_test_util.cc
+++ b/components/dom_distiller/core/dom_distiller_test_util.cc
@@ -91,10 +91,10 @@ HasExpectedUpdates(
 
 // static
 DomDistillerStore* CreateStoreWithFakeDB(FakeDB* fake_db,
-                                         FakeDB::EntryMap* store_model) {
+                                         const FakeDB::EntryMap& store_model) {
   return new DomDistillerStore(
       scoped_ptr<DomDistillerDatabaseInterface>(fake_db),
-      EntryMapToList(*store_model),
+      EntryMapToList(store_model),
       FakeDB::DirectoryForTestDB());
 }