Reviewed by anders

    Reviewed by anders

        <rdar://problem/4426622>
        Plain text paste slow.  Time spent mostly in WebCore::rebalanceWhitespaceInTextNode(...)

        * editing/htmlediting.cpp:
        (WebCore::rebalanceWhitespaceInTextNode): We no longer need to use a RegExp replace because we
        aren't producing complicated sequences here.  Use multiple UChar -> UChar replaces instead for speed.
        Got rid of uses of DepricatedString.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@16510 268f45cc-cd09-0410-ab3c-d52691b4dbfc