Reviewed by Eric Seidel.

        Tests for a crash when an image drag-drop operation happens inside a continuously refreshing iframe.
        https://bugs.webkit.org/show_bug.cgi?id=37618

        * editing/pasteboard/drag-drop-iframe-refresh-crash-expected.txt: Added.
        * editing/pasteboard/drag-drop-iframe-refresh-crash.html: Added.
        * editing/resources/drag-drop.html: Added.
2010-04-28  Abhishek Arya  <inferno@chromium.org>

        Reviewed by Eric Seidel.

        Convert m_documentUnderMouse, m_dragInitiator to RefPtr.
        Eliminated unused m_dragInitiator accessor to prevent dereferencing.
        https://bugs.webkit.org/show_bug.cgi?id=37618

        Test: editing/pasteboard/drag-drop-iframe-refresh-crash.html

        * page/DragController.cpp:
        (WebCore::DragController::tryDocumentDrag):
        (WebCore::DragController::concludeEditDrag):
        * page/DragController.h:
        (WebCore::DragController::draggingImageURL):
        (WebCore::DragController::documentUnderMouse):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@58441 268f45cc-cd09-0410-ab3c-d52691b4dbfc