successCallback of ResolveLocalFileSystemURL should not be optional.
https://bugs.webkit.org/show_bug.cgi?id=94802

Patch by Taiju Tsuiki <tzik@chromium.org> on 2012-09-09
Reviewed by Kent Tamura.

Spec says it should not optional.
http://www.w3.org/TR/file-system-api/#widl-LocalFileSystem-resolveLocalFileSystemURL-void-DOMString-url-EntryCallback-successCallback-ErrorCallback-errorCallback

Source/WebCore:

Tests: fast/filesystem/entry-points-missing-arguments.html

* Modules/filesystem/DOMWindowFileSystem.idl:
* Modules/filesystem/WorkerContextFileSystem.idl:

LayoutTests:

* fast/filesystem/entry-points-missing-arguments-expected.txt: Added.
* fast/filesystem/entry-points-missing-arguments.html: Added.
* fast/filesystem/filesystem-no-callback-null-ptr-crash.html:

git-svn-id: svn://svn.chromium.org/blink/trunk@128018 bbb929c8-8fbe-4397-9dbb-9b2b20218538