storage/indexeddb/modern/idbdatabase-deleteobjectstore-failures.html is flaky.

storage/indexeddb/modern/idbdatabase-deleteobjectstore-failures.html is flaky.
https://bugs.webkit.org/show_bug.cgi?id=150735

Reviewed by Darin Adler.

Source/WebCore:

No new tests (Covered by existing tests).

Transactions were liable to commit too early because IDBRequests could be waiting
to dispatch their error/success events but their operations would no longer be
registered with the transaction.

Having outstanding requests should also keep a transaction from committing, just
like having outstanding operations should.

* Modules/indexeddb/client/IDBOpenDBRequestImpl.cpp:
(WebCore::IDBClient::IDBOpenDBRequest::onUpgradeNeeded):

* Modules/indexeddb/client/IDBRequestImpl.cpp:
(WebCore::IDBClient::IDBRequest::dispatchEvent):

* Modules/indexeddb/client/IDBTransactionImpl.cpp:
(WebCore::IDBClient::IDBTransaction::addRequest):
(WebCore::IDBClient::IDBTransaction::removeRequest):
(WebCore::IDBClient::IDBTransaction::operationTimerFired):
(WebCore::IDBClient::IDBTransaction::requestGetRecord):
(WebCore::IDBClient::IDBTransaction::requestClearObjectStore):
(WebCore::IDBClient::IDBTransaction::requestPutOrAdd):
(WebCore::IDBClient::IDBTransaction::operationDidComplete):
* Modules/indexeddb/client/IDBTransactionImpl.h:

* Modules/indexeddb/client/TransactionOperation.h:
(WebCore::IDBClient::TransactionOperation::completed):

LayoutTests:

* platform/mac-wk1/TestExpectations: Reenable the test.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@191847 268f45cc-cd09-0410-ab3c-d52691b4dbfc