Reviewed by Maciej.

    Reviewed by Maciej.

        - fix http://bugzilla.opendarwin.org/show_bug.cgi?id=4616
          Setting nodeValue on a textnode with collapsed whitespace only has no visual effect

        Test: fast/dom/space-to-text.html

        * dom/CharacterData.cpp:
        (WebCore::CharacterData::setData): Create a renderer if it's needed, but missing.
        (WebCore::CharacterData::appendData): Ditto.
        (WebCore::CharacterData::insertData): Ditto.
        (WebCore::CharacterData::replaceData): Ditto.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@13552 268f45cc-cd09-0410-ab3c-d52691b4dbfc