Indexed DB: Remove vendor prefix removal from tests

LayoutTests/storage/indexeddb/duplicates-expected.txt

Index: LayoutTests/storage/indexeddb/duplicates-expected.txt
diff --git a/LayoutTests/storage/indexeddb/duplicates-expected.txt b/LayoutTests/storage/indexeddb/duplicates-expected.txt
index af0bb4b246813148df2afe2b7d3d3f57efc8483c..e41664b9689a2f3855153b56a4cddee0acf64455 100644
--- a/LayoutTests/storage/indexeddb/duplicates-expected.txt
+++ b/LayoutTests/storage/indexeddb/duplicates-expected.txt
@@ -3,8 +3,6 @@ Verify that you can put the same data in 2 different databases without uniquenes
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB;
-
 dbname = "duplicates.html-1"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
@@ -43,8 +41,6 @@ PASS event.target.result.value.x is "value2"
 PASS event.target.result.value.y is "zzz2"
 event.target.result.continue()
 PASS event.target.result is null
-indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB;
-
 dbname = "duplicates.html-2"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)