Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/resources/intversion-persistence.js

 if (this.importScripts) {
     importScripts('../../../resources/js-test.js');
     importScripts('shared.js');
 }
 
 description("Test that integer versions are retained when backing store is opened/closed/re-opened.");
 
 function test()
 {
-    removeVendorPrefixes();
     setDBNameFromPath();
 
     // NOTE: deleteDatabase is not used, otherwise it would set the backing store schema version
     // which would conceal the failure being tested for. Instead, a unique name is used each time.
     evalAndLog("dbname = dbname + Date.now()");
 
     openFirstTime();
 }
 
 function openFirstTime() {
@@ skipping 29 matching lines @@
         evalAndLog("db = request.result");
         shouldBe("db.version", "1");
         shouldBe("db.objectStoreNames.length", "1");
         evalAndLog("db.close()");
         debug("");
         finishJSTest();
     };
 }
 
 test();