Fix memory leak in readingListPrivate api test.

components/dom_distiller/core/dom_distiller_test_util.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_TEST_UTIL_H_
 #define COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_TEST_UTIL_H_
 
 #include <vector>
 
 #include "components/dom_distiller/core/dom_distiller_observer.h"
@@ skipping 25 matching lines @@
   void DescribeUpdates(std::ostream* os) const;
   const std::vector<DomDistillerObserver::ArticleUpdate>& expected_updates_;
 };
 
 testing::Matcher<const std::vector<DomDistillerObserver::ArticleUpdate>&>
     HasExpectedUpdates(const std::vector<DomDistillerObserver::ArticleUpdate>&);
 
 // Creates a simple DomDistillerStore backed by |fake_db| and initialized
 // with |store_model|.
 DomDistillerStore* CreateStoreWithFakeDB(FakeDB* fake_db,
-                                         FakeDB::EntryMap* store_model);
+                                         const FakeDB::EntryMap& store_model);
 
 }  // namespace util
 }  // namespace test
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CORE_DOM_DISTILLER_TEST_UTIL_H_