[Offline Pages] Duplicate pages when save/delete bookmarks.

components/offline_pages/offline_page_model_impl.h

Index: components/offline_pages/offline_page_model_impl.h
diff --git a/components/offline_pages/offline_page_model_impl.h b/components/offline_pages/offline_page_model_impl.h
index 11769ee919fd4c47f7cea81fca071f3ebde3e8c2..1e74a3f39f5894ad66314666f59188ef7056a8ad 100644
--- a/components/offline_pages/offline_page_model_impl.h
+++ b/components/offline_pages/offline_page_model_impl.h
@@ -208,6 +208,13 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   void OnDeleteOrphanedArchivesDone(const std::vector<base::FilePath>& archives,
                                     bool success);
 
+  // Callbacks for deleting pages with same URL when saving pages.
+  void OnPagesFoundWithSameURL(const ClientId& client_id,
+                               int64_t offline_id,
+                               size_t pages_allowed,
+                               const MultipleOfflinePageItemResult& items);
+  void OnDeleteOldPagesWithSameURL(DeletePageResult result);
+
   // Steps for clearing all.
   void OnRemoveAllFilesDoneForClearAll(const base::Closure& callback,
                                        DeletePageResult result);
@@ -241,6 +248,9 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   void OnStorageCleared(size_t expired_page_count,
                         OfflinePageStorageManager::ClearStorageResult result);
 
+  // Post task to clear storage.
+  void PostClearStorageIfNeededTask();
+
   void RunWhenLoaded(const base::Closure& job);
 
   // Persistent store for offline page metadata.