Reviewed by John.
        
        <rdar://problem/5290534> Crash RenderTextControl::calcHeight() after deleting text in a search field

        Demonstrates the bug:
        * editing/deleting/5290534-expected.txt: Added.
        * editing/deleting/5290534.html: Added.

        Fixed a bug (an extra br was inserted) and removed a FIXME:
        * editing/deleting/4845371-expected.checksum:
        * editing/deleting/4845371-expected.png:
        * editing/deleting/4845371-expected.txt:
        * editing/deleting/4845371.html:
        
        Removed an unrendered br that was being incorrectly inserted:
        * editing/deleting/5126166-expected.txt:

WebCore:

        Reviewed by John.

        <rdar://problem/5290534> Crash at RenderTextControl::calcHeight() after deleting text in a search field
        
        Editing removed a node that was part of a search field's internal
        structure that should not be removed.

        * editing/DeleteSelectionCommand.cpp:
        (WebCore::DeleteSelectionCommand::handleGeneralDelete): If the
        selection to delete ends at [container, x], where x is the number
        of children in container, don't remove container.  Special case
        code elsewhere in this function will remove it if necessary.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@23787 268f45cc-cd09-0410-ab3c-d52691b4dbfc