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        Reviewed by Darin Adler.

        Fix for <rdar://problem/6703873> Triple-click quoted line and type Return creates an extra quoted blank line

        Test: editing/inserting/6703873.html

        * editing/BreakBlockquoteCommand.cpp: (WebCore::BreakBlockquoteCommand::doApply):
        If the startNode's original parent is now empty, we can remove it.  Its already been cloned and copied with the startNode,
        so we only need to keep it around if it actually holds some original content, otherwise it will look like an extra empty 
        container in the document.



git-svn-id: svn://svn.chromium.org/blink/trunk@42501 bbb929c8-8fbe-4397-9dbb-9b2b20218538