IndexedDB: Simplify IDBTransactionBackendImpl::scheduleTask usage
https://bugs.webkit.org/show_bug.cgi?id=103536

Reviewed by Tony Chang.

Source/WebCore:

Move responsibility for firing abort errors from requests that arrive on the
back-end after an asynchronous transaction abort out of WebCore, since the
front-end takes care of this as far as script is concerned.

No new tests -  no behavior changes.

* Modules/indexeddb/IDBCursorBackendImpl.cpp:
(WebCore::IDBCursorBackendImpl::continueFunction):
(WebCore::IDBCursorBackendImpl::advance):
(WebCore::IDBCursorBackendImpl::prefetchContinue):
* Modules/indexeddb/IDBIndexBackendImpl.cpp:
(WebCore::IDBIndexBackendImpl::openCursor):
(WebCore::IDBIndexBackendImpl::openKeyCursor):
(WebCore::IDBIndexBackendImpl::count):
(WebCore::IDBIndexBackendImpl::get):
(WebCore::IDBIndexBackendImpl::getKey):
* Modules/indexeddb/IDBObjectStoreBackendImpl.cpp:
(WebCore::IDBObjectStoreBackendImpl::get):
(WebCore::IDBObjectStoreBackendImpl::put):
(WebCore::IDBObjectStoreBackendImpl::deleteFunction):
(WebCore::IDBObjectStoreBackendImpl::clear):
(WebCore::IDBObjectStoreBackendImpl::openCursor):
(WebCore::IDBObjectStoreBackendImpl::count):

Source/WebKit/chromium:

Track whether IDBCallbacks has fired before being destructed. If not it probably
came in after a transaction had asynchronously aborted; fire an abort error which
will be ignored on the front-end but will clean up lingering IPC tracking.

* public/WebIDBDatabaseException.h:
* src/AssertMatchingEnums.cpp:
* src/IDBCallbacksProxy.cpp:
(WebKit::IDBCallbacksProxy::IDBCallbacksProxy):
(WebKit::IDBCallbacksProxy::~IDBCallbacksProxy):
(WebKit::IDBCallbacksProxy::onError):
(WebKit::IDBCallbacksProxy::onSuccess):
* src/IDBCallbacksProxy.h:
(IDBCallbacksProxy):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138716 268f45cc-cd09-0410-ab3c-d52691b4dbfc