https://bugs.webkit.org/show_bug.cgi?id=108154

Reviewed by Jochen Eisinger.

In order to properly support blocking third-party IndexedDB usage,
open(), getDatabaseNames(), and deleteDatabase() should all throw
SECURITY_ERR when used in a blocked third-party context. That's possible
now for open() and deleteDatabase(), but getDatabaseNames() can't
currently raise exceptions.

This patch adjusts the IDL file and implementation. No exceptions are
currently thrown, but that will change as soon as wkbug.com/94171 lands.

* Modules/indexeddb/IDBFactory.cpp:
(WebCore::IDBFactory::getDatabaseNames):
* Modules/indexeddb/IDBFactory.h:
(IDBFactory):
* Modules/indexeddb/IDBFactory.idl:
    Add "raises (DOMException)" to getDatabaseNames, and adjust the
    implementation to match.
* inspector/InspectorIndexedDBAgent.cpp:
(WebCore::InspectorIndexedDBAgent::requestDatabaseNamesForFrame):
    Pass in an ExceptionCode when calling getDatabaseNames, and handle
    possible exceptions.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141090 268f45cc-cd09-0410-ab3c-d52691b4dbfc