Reviewed by Adele Peterson.

        Possible crashes when mouse clicks not dispatched because range input destroyed while 
        thumb is being dragged (e.g. scrub to end of movie)
        <rdar://problem/7037494> 
        https://bugs.webkit.org/show_bug.cgi?id=27101

        Some shadow nodes "capture" all mouse events from mouseDown to mouseUp so they continue to 
        get mouse events even when the mouse is moved outside of the node. This is done by putting
        EventHandler into a mode where it sends all mouse events to the node regardless of the
        actual mouse position. The mode is set on mouseDown and cleared on mouseUp but if the
        node is deleted while in this mode, the mouseUp is never sent and EventHandler continues
        to try to send events to the deleted node. This sometimes results in a crash, and sometimes
        in a page that doesn't respond to click events.

        Tests: fast/forms/search-delete-while-cancel-button-clicked.html
               fast/forms/slider-delete-while-dragging-thumb.html
               media/audio-delete-while-slider-thumb-clicked.html
               media/audio-delete-while-step-button-clicked.html

        * rendering/MediaControlElements.cpp:
        (WebCore::MediaControlSeekButtonElement::detach):
            New, call setCapturingMouseEventsNode if capturing mouse events.
        * rendering/MediaControlElements.h:
            Declare detach().

        * rendering/RenderSlider.cpp:
        (WebCore::SliderThumbElement::detach):
            New, call setCapturingMouseEventsNode if capturing mouse events.

        * rendering/TextControlInnerElements.cpp:
        (WebCore::SearchFieldCancelButtonElement::detach):
            New, call setCapturingMouseEventsNode if capturing mouse events.
        * rendering/TextControlInnerElements.h:
            Declare detach().

2009-07-09  Eric Carlson  <eric.carlson@apple.com>

        Reviewed by Adele Peterson.

        Possible crashes when mouse clicks not dispatched because range input destroyed while 
        thumb is being dragged (e.g. scrub to end of movie)
        <rdar://problem/7037494> 
        https://bugs.webkit.org/show_bug.cgi?id=27101

        Tests deleting a control while capturing mouse events.

        * fast/forms/search-delete-while-cancel-button-clicked-expected.txt: Added.
        * fast/forms/search-delete-while-cancel-button-clicked.html: Added.
        * fast/forms/slider-delete-while-dragging-thumb-expected.txt: Added.
        * fast/forms/slider-delete-while-dragging-thumb.html: Added.
        * media/audio-delete-while-slider-thumb-clicked-expected.txt: Added.
        * media/audio-delete-while-slider-thumb-clicked.html: Added.
        * media/audio-delete-while-step-button-clicked-expected.txt: Added.
        * media/audio-delete-while-step-button-clicked.html: Added.

        * platform/mac-snowleopard/Skipped:
            Skip the new media controller tests until <rdar://problem/6502936> is fixed.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@45662 268f45cc-cd09-0410-ab3c-d52691b4dbfc