Minor IndexedDB refactorings.

third_party/WebKit/Source/modules/indexeddb/IDBMetadata.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/indexeddb/IDBMetadata.h"
 
 #include "public/platform/modules/indexeddb/WebIDBMetadata.h"
 
 namespace blink {
 
+constexpr int64_t IDBIndexMetadata::InvalidId;
+
+constexpr int64_t IDBObjectStoreMetadata::InvalidId;
+
 IDBDatabaseMetadata::IDBDatabaseMetadata(const WebIDBMetadata& webMetadata)
     : name(webMetadata.name)
     , id(webMetadata.id)
     , version(webMetadata.version)
     , maxObjectStoreId(webMetadata.maxObjectStoreId)
 {
     for (size_t i = 0; i < webMetadata.objectStores.size(); ++i) {
         const WebIDBMetadata::ObjectStore webObjectStore = webMetadata.objectStores[i];
         IDBObjectStoreMetadata objectStore(webObjectStore.name, webObjectStore.id, IDBKeyPath(webObjectStore.keyPath), webObjectStore.autoIncrement, webObjectStore.maxIndexId);
 
         for (size_t j = 0; j < webObjectStore.indexes.size(); ++j) {
             const WebIDBMetadata::Index webIndex = webObjectStore.indexes[j];
             IDBIndexMetadata index(webIndex.name, webIndex.id, IDBKeyPath(webIndex.keyPath), webIndex.unique, webIndex.multiEntry);
             objectStore.indexes.set(index.id, index);
         }
         objectStores.set(objectStore.id, objectStore);
     }
 }
 
 } // namespace blink