IndexedDB: Defer delete calls when there is a running upgrade

third_party/WebKit/LayoutTests/storage/indexeddb/delete-in-upgradeneeded-close-in-open-success-expected.txt

 Test that a deleteDatabase called while handling an upgradeneeded event is queued and fires its events at the right time. The close() call to unblock the delete occurs in the open request's 'success' event handler.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 dbname = "delete-in-upgradeneeded-close-in-open-success.html"
 indexedDB.deleteDatabase(dbname)
 
 initiallyDeleted():
 request = indexedDB.open(dbname, 1)
 
 upgradeNeededCallback():
 PASS sawUpgradeNeeded is false
 sawUpgradeNeeded = true
 PASS event.oldVersion is 0
 PASS event.newVersion is 1
 db = event.target.result
 request2 = indexedDB.deleteDatabase(dbname)
 request2.onsuccess = deleteSuccessCallback
 
+openSuccess():
+PASS sawUpgradeNeeded is true
+PASS sawVersionChange is false
+sawOpenSuccess = true
+db = event.target.result
+PASS db.version is 1
+
 versionChangeCallback():
 PASS event.oldVersion is 1
 PASS event.newVersion is null
-PASS sawOpenSuccess is false
+PASS sawOpenSuccess is true
 sawVersionChange = true
 Connection not closed at the end of 'versionchange', so 'blocked' should fire
 
-openSuccess():
-PASS sawUpgradeNeeded is true
-PASS sawVersionChange is true
-sawOpenSuccess = true
-db = event.target.result
-PASS db.version is 1
-Closing here is too late to prevent the in-flight 'blocked' event, but it does unblock the delete.
-db.close()
-
 deleteBlockedCallback():
 PASS sawVersionChange is true
 PASS sawOpenSuccess is true
 sawDeleteBlocked = true
+db.close()
 
 deleteSuccessCallback():
 PASS sawVersionChange is true
 PASS sawDeleteBlocked is true
 PASS successfullyParsed is true
 
 TEST COMPLETE