[Offline Pages] Set up the initial prefetching service.

components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc

Index: components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc
diff --git a/components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc b/components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7b7ef126e33b8a376337aedb4e3d4fd6f1579f5f
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+++ b/components/offline_pages/core/prefetch/prefetch_service_impl_unittest.cc
@@ -0,0 +1,21 @@
+// Copyright 2017 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.
+
+#include "components/offline_pages/core/prefetch/prefetch_service_impl.h"
+
+#include "components/offline_pages/core/client_namespace_constants.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+
+namespace offline_pages {
+
+TEST(PrefetchServiceTest, ServiceDoesNotCrash) {
+  PrefetchServiceImpl service;
+
+  service.OnNewURLsToPrefetch(std::vector<PrefetchService::PrefetchURL>());
+  service.RemoveAllUnprocessedPrefetchURLs(kSuggestedArticlesNamespace);
+  service.RemovePrefetchURLsByClientId({kSuggestedArticlesNamespace, "123"});
+}
+
+}  // namespace offline_pages