Align IndexedDB metadata rollback on transaction abort to spec.

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

Index: third_party/WebKit/Source/modules/indexeddb/IDBObjectStore.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBObjectStore.h b/third_party/WebKit/Source/modules/indexeddb/IDBObjectStore.h
index 8ee6519da8f203f6902bf6ba4a2385450faec8b6..c2c4736bf4cb4983b56aa7c854a53948f21f8311 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBObjectStore.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBObjectStore.h
@@ -97,11 +97,14 @@ public:
 
     void markDeleted() { m_deleted = true; }
     bool isDeleted() const { return m_deleted; }
-    void abort();
+    void versionChangeTransactionAborted();
     void transactionFinished();
 
     const IDBObjectStoreMetadata& metadata() const { return m_metadata; }
-    void setMetadata(const IDBObjectStoreMetadata& metadata) { m_metadata = metadata; }
+    // Rolls back the object store's metadata to a previous version.
+    //
+    // Used when a versionchange transaction is aborted.
+    void rollbackMetadata(const IDBObjectStoreMetadata& previousMetadata);
 
     typedef HeapVector<Member<IDBKey>> IndexKeys;