Prefetching: Introduce store commands abstractions to be used by tasks.

chrome/browser/offline_pages/prefetch/prefetch_service_factory.cc

Index: chrome/browser/offline_pages/prefetch/prefetch_service_factory.cc
diff --git a/chrome/browser/offline_pages/prefetch/prefetch_service_factory.cc b/chrome/browser/offline_pages/prefetch/prefetch_service_factory.cc
index 92eed1c40328e06a1fafd57f5aaf200c70c3f40c..eeb6acd72819d577fb2ba8eb2a4627acc278fc55 100644
--- a/chrome/browser/offline_pages/prefetch/prefetch_service_factory.cc
+++ b/chrome/browser/offline_pages/prefetch/prefetch_service_factory.cc
@@ -14,7 +14,6 @@
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/offline_pages/core/prefetch/prefetch_dispatcher_impl.h"
 #include "components/offline_pages/core/prefetch/prefetch_gcm_app_handler.h"
-#include "components/offline_pages/core/prefetch/prefetch_in_memory_store.h"
 #include "components/offline_pages/core/prefetch/prefetch_service_impl.h"
 #include "components/offline_pages/core/prefetch/suggested_articles_observer.h"
 #include "content/public/browser/browser_context.h"
@@ -47,12 +46,11 @@ KeyedService* PrefetchServiceFactory::BuildServiceInstanceFor(
       base::MakeUnique<OfflineMetricsCollectorImpl>();
   auto suggested_articles_observer =
       base::MakeUnique<SuggestedArticlesObserver>(prefetch_dispatcher.get());
-  auto in_memory_store = base::MakeUnique<PrefetchInMemoryStore>();
 
-  return new PrefetchServiceImpl(
-      std::move(offline_metrics_collector), std::move(prefetch_dispatcher),
-      std::move(prefetch_gcm_app_handler), std::move(in_memory_store),
-      std::move(suggested_articles_observer));
+  return new PrefetchServiceImpl(std::move(offline_metrics_collector),
+                                 std::move(prefetch_dispatcher),
+                                 std::move(prefetch_gcm_app_handler),
+                                 std::move(suggested_articles_observer));
 }
 
 }  // namespace offline_pages