Reviewed by Darin Adler.

        click event shouldn't fire when the target is ever removed in mouseup
        https://bugs.webkit.org/show_bug.cgi?id=60600

        Added tests to ensure WebKit does not fire click event when the target node
        is removed in mouseup event.

        * fast/events/remove-target-in-mouseup-deep-expected.txt: Added.
        * fast/events/remove-target-in-mouseup-deep.html: Added.
        * fast/events/remove-target-in-mouseup-expected.txt: Added.
        * fast/events/remove-target-in-mouseup-insertback-expected.txt: Added.
        * fast/events/remove-target-in-mouseup-insertback.html: Added.
        * fast/events/remove-target-in-mouseup-twice-expected.txt: Added.
        * fast/events/remove-target-in-mouseup-twice.html: Added.
        * fast/events/remove-target-in-mouseup.html: Added.
2011-05-13  Ryosuke Niwa  <rniwa@webkit.org>

        Reviewed by Darin Adler.

        click event shouldn't fire when the target is ever removed in mouseup
        https://bugs.webkit.org/show_bug.cgi?id=60600

        Fixed the bug by invalidating m_clickNode when it or one of its ancestors has been removed
        from the document. New behavior matches Internet Explorer and Firefox.

        Tests: fast/events/remove-target-in-mouseup-deep.html
               fast/events/remove-target-in-mouseup-insertback.html
               fast/events/remove-target-in-mouseup-twice.html
               fast/events/remove-target-in-mouseup.html

        * dom/Document.cpp:
        (WebCore::Document::nodeChildrenWillBeRemoved): Calls EventHandler::nodeWillBeRemoved.
        (WebCore::Document::nodeWillBeRemoved): Calls EventHandler::nodeWillBeRemoved.
        * page/EventHandler.cpp:
        (WebCore::EventHandler::nodeWillBeRemoved): Added; invalidates m_clickNode when m_clickNode
        or one of its ancestor is removed from the document.
        * page/EventHandler.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@86461 268f45cc-cd09-0410-ab3c-d52691b4dbfc