Reviewed by harrison
        
        <rdar://problem/4903193> 
        On particular page, Copy is so slow it seems like a hang

        Less messy DOM trees:
        * editing/deleting/delete-3857753-fix-expected.txt:
        * editing/inserting/insert-3786362-fix-expected.txt:
        * editing/inserting/insert-3907422-fix-expected.txt:
        * editing/pasteboard/display-block-on-spans-expected.txt:
        * editing/pasteboard/paste-4035648-fix-expected.txt:
        * editing/pasteboard/paste-4039777-fix-expected.txt:
        * editing/pasteboard/paste-line-endings-001-expected.txt:
        * editing/pasteboard/paste-line-endings-006-expected.txt:
        * editing/pasteboard/paste-list-001-expected.txt:
        * editing/pasteboard/paste-pre-001-expected.txt:
        * editing/pasteboard/paste-pre-002-expected.txt:
        * editing/pasteboard/paste-table-001-expected.txt:
        * editing/pasteboard/paste-table-002-expected.txt:
        * editing/pasteboard/paste-text-003-expected.txt:
        * editing/pasteboard/paste-text-011-expected.txt:
        * editing/pasteboard/paste-text-015-expected.txt:
        * editing/pasteboard/paste-text-016-expected.txt:
        * editing/pasteboard/paste-text-017-expected.txt:
        * editing/pasteboard/styled-element-markup-expected.txt:
        * editing/pasteboard/testcase-9507-expected.txt:
        * editing/style/smoosh-styles-001-expected.txt:
        * editing/style/smoosh-styles-002-expected.txt:
        * fast/lists/drag-into-marker-expected.txt:
        Styles from style sheets are now inlined:
        * webarchive/test-duplicate-resources-expected.txt:
        * webarchive/test-frameset-expected.txt:
        * webarchive/test-link-href-expected.txt:\
        Two levels of nesting are removed, but text nodes are no
        longer coalesced when they should be, investigating:
        * editing/pasteboard/block-wrappers-necessary-expected.txt:

WebCore:

        Reviewed by harrison
        
        <rdar://problem/4903193> 
        On particular page, Copy is so slow it seems like a hang
        
        ~2x speedup copying:
        http://shakespeare.mit.edu/henryviii/full.html 
        Also produces less bloated markup.

        * editing/markup.cpp:
        (WebCore::startMarkup): Don't wrap text nodes in style spans.
        For Elements, don't inline styles inherited from ancestors.
        (WebCore::createMarkup): No longer necessary to find 
        the root's default style and pass it to startMarkup.
        Add a wrapper span around the markup with the styles
        that all nodes in the markup inherit (the inheritable 
        styles from the common ancestor container's computed style).
        Added a FIXME about unecessary markup for inline ancestors 
        up to the commonAncestorBlock.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@20075 268f45cc-cd09-0410-ab3c-d52691b4dbfc