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

components/offline_pages/core/prefetch/prefetch_service.h

Index: components/offline_pages/core/prefetch/prefetch_service.h
diff --git a/components/offline_pages/core/prefetch/prefetch_service.h b/components/offline_pages/core/prefetch/prefetch_service.h
index 3d00d980534d111649ec0343f6ee4b206c230b59..a98d9005613651a9fdc4f6b8be5a913be6160a04 100644
--- a/components/offline_pages/core/prefetch/prefetch_service.h
+++ b/components/offline_pages/core/prefetch/prefetch_service.h
@@ -12,7 +12,7 @@ class OfflineEventLogger;
 class OfflineMetricsCollector;
 class PrefetchDispatcher;
 class PrefetchGCMHandler;
-class PrefetchStore;
+class PrefetchStoreCommandFactory;
 class SuggestedArticlesObserver;
 
 // Main class and entry point for the Offline Pages Prefetching feature, that
@@ -26,11 +26,11 @@ class PrefetchService : public KeyedService {
   // The service manages lifetime, hookup and initialization of Prefetch
   // system that consists of multiple specialized objects, all vended by this
   // service.
+  virtual OfflineEventLogger* GetLogger() = 0;
   virtual OfflineMetricsCollector* GetOfflineMetricsCollector() = 0;
   virtual PrefetchDispatcher* GetPrefetchDispatcher() = 0;
   virtual PrefetchGCMHandler* GetPrefetchGCMHandler() = 0;
-  virtual PrefetchStore* GetPrefetchStore() = 0;
-  virtual OfflineEventLogger* GetLogger() = 0;
+  virtual PrefetchStoreCommandFactory* GetPrefetchStoreCommandFactory() = 0;
 
   // May be |nullptr| in tests.  The PrefetchService does not depend on the
   // SuggestedArticlesObserver, it merely owns it for lifetime purposes.