Refactor Reading List Model to use URL as key.

components/reading_list/ios/reading_list_store.h

Index: components/reading_list/ios/reading_list_store.h
diff --git a/components/reading_list/ios/reading_list_store.h b/components/reading_list/ios/reading_list_store.h
index f8896b0984d2398c4c75debfb4e5959d2ff8d3e9..ab90ca43d584cee4962e813e9dbc97d72adf9a81 100644
--- a/components/reading_list/ios/reading_list_store.h
+++ b/components/reading_list/ios/reading_list_store.h
@@ -35,7 +35,7 @@ class ReadingListStore : public syncer::ModelTypeSyncBridge,
   void SetReadingListModel(ReadingListModel* model,
                            ReadingListStoreDelegate* delegate) override;
 
-  void SaveEntry(const ReadingListEntry& entry, bool read) override;
+  void SaveEntry(const ReadingListEntry& entry) override;
   void RemoveEntry(const ReadingListEntry& entry) override;
 
   // ReadingListModelStorage implementation.
@@ -123,8 +123,7 @@ class ReadingListStore : public syncer::ModelTypeSyncBridge,
                          std::unique_ptr<syncer::MetadataBatch> metadata_batch);
 
   void AddEntryToBatch(syncer::MutableDataBatch* batch,
-                       const ReadingListEntry& entry,
-                       bool read);
+                       const ReadingListEntry& entry);
 
   std::unique_ptr<syncer::ModelTypeStore> store_;
   ReadingListModel* model_;