Align IndexedDB metadata rollback on transaction abort to spec.

third_party/WebKit/Source/modules/indexeddb/IDBDatabase.h

Index: third_party/WebKit/Source/modules/indexeddb/IDBDatabase.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.h b/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.h
index 64d566a3b653f67506659fcfa8826216bf0a3d76..1a5e7b7cd521b972153caa4e6b630c2ffe88cabc 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.h
@@ -64,10 +64,10 @@ public:
     ~IDBDatabase() override;
     DECLARE_VIRTUAL_TRACE();
 
-    void setMetadata(const IDBDatabaseMetadata& metadata) { m_metadata = metadata; }
-    void indexCreated(int64_t objectStoreId, const IDBIndexMetadata&);
-    void indexDeleted(int64_t objectStoreId, int64_t indexId);
-    void indexRenamed(int64_t objectStoreId, int64_t indexId, const String& newName);
+    // Overwrites the database metadata, including object store and index metadata.
+    void setMetadata(const IDBDatabaseMetadata&);
+    // Overwrites the database's own metadata, but does not change object store and index metadata.
+    void setDatabaseMetadata(const IDBDatabaseMetadata&);
     void transactionCreated(IDBTransaction*);
     void transactionFinished(const IDBTransaction*);
     const String& getObjectStoreName(int64_t objectStoreId) const;
@@ -112,7 +112,9 @@ public:
     {
         return findObjectStoreId(name) != IDBObjectStoreMetadata::InvalidId;
     }
-    void objectStoreRenamed(int64_t storeId, const String& newName);
+    void renameObjectStore(int64_t storeId, const String& newName);
+    void revertObjectStoreCreation(int64_t objectStoreId);
+    void revertObjectStoreMetadata(RefPtr<IDBObjectStoreMetadata> oldMetadata);
 
     // Will return nullptr if this database is stopped.
     WebIDBDatabase* backend() const { return m_backend.get(); }