[BlackBerry] Filesystem callback notifyCreateSnapshotFileAndReadMetadata can be called on the wring thread
https://bugs.webkit.org/show_bug.cgi?id=114610

Patch by Carlos Garcia Campos <cgarcia@igalia.com> on 2013-04-15
Reviewed by Xan Lopez.

Override notifyCreateSnapshotFileAndReadMetadata to make sure the
callback is called on the right thread.

Fixes a crash in several fast/filesystem test in debug builds.

* platform/blackberry/WorkerPlatformAsyncFileSystemCallbacks.cpp:
(WebCore::WorkerPlatformAsyncFileSystemCallbacks::notifyCreateSnapshotFileAndReadMetadata):
(WebCore::WorkerPlatformAsyncFileSystemCallbacks::notifyCreateSnapshotFileAndReadMetadataOnWorkerThread):
* platform/blackberry/WorkerPlatformAsyncFileSystemCallbacks.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148425 268f45cc-cd09-0410-ab3c-d52691b4dbfc