IndexedDB: Stop using webkit-prefixed versions of APIs in tests

tools/perf/page_sets/endure/indexeddb_app_worker.js

 // Copyright 2013 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.
 
 // This file simulates a typical background process of an offline-capable
 // authoring application. When in an "online" state it receives chunks of
 // data updates from a simulated server and stores them in a temporary IDB
 // data store. On a different timer, the chunks are drained from the
 // temporary store and combined into larger records in a permanent store.
 // When in an "offline" state, nothing else happens.
 
-self.indexedDB = self.indexedDB || self.webkitIndexedDB ||
-  self.mozIndexedDB;
-self.IDBKeyRange = self.IDBKeyRange || self.webkitIDBKeyRange;
-
 function unexpectedErrorCallback(e) {
-  self.postMessage({type: 'ERROR', error: { name: e.target.error.name },
-                    webkitErrorMessage: e.target.webkitErrorMessage});
+  self.postMessage({type: 'ERROR', error: {
+    name: e.target.error.name,
+    message: e.target.error.message
+  }});
 }
 
 function unexpectedAbortCallback(e) {
-  self.postMessage({type: 'ABORT', error: { name: e.target.error.name },
-                    webkitErrorMessage: e.target.webkitErrorMessage});
+  self.postMessage({type: 'ABORT', error: {
+    name: e.target.error.name,
+    message: e.target.error.message
+  }});
 }
 
 function log(message) {
   self.postMessage({type: 'LOG', message: message});
 }
 
 function error(message) {
   self.postMessage({type: 'ERROR', message: message});
 }
 
@@ skipping 180 matching lines @@
       }
     };
     transaction.onabort = unexpectedAbortCallback;
     transaction.oncomplete = function () {
       log('combine ' + combine_id +
           ' finished, processed ' + combine_chunk_count + ' chunks');
       db.close();
       combineTimeoutId = setTimeout(combine, COMBINE_TIMEOUT);
     };
   };
-}
+}