[Offline pages] Extracting AddRequest method in RequestQueueStore

components/offline_pages/offline_page_metadata_store.h

Index: components/offline_pages/offline_page_metadata_store.h
diff --git a/components/offline_pages/offline_page_metadata_store.h b/components/offline_pages/offline_page_metadata_store.h
index 2447e23e10cf63b6ba585bbe4fdeebc36db47ab7..03f9873e7bd7fdf7a8713fa5b2c0fc6403457175 100644
--- a/components/offline_pages/offline_page_metadata_store.h
+++ b/components/offline_pages/offline_page_metadata_store.h
@@ -11,6 +11,7 @@
 
 #include "base/callback.h"
 #include "components/offline_pages/offline_page_item.h"
+#include "components/offline_pages/offline_page_types.h"
 
 class GURL;
 
@@ -26,14 +27,6 @@ enum class StoreState {
   FAILED_RESET,    // Resetting the store failed.
 };
 
-// Statuses referring to actions taken on items in the store.
-enum class ItemActionStatus {
-  SUCCESS,
-  ALREADY_EXISTS,
-  NOT_FOUND,
-  STORE_ERROR,
-};
-
 class StoreUpdateResult {
  public:
   explicit StoreUpdateResult(StoreState state);