Reviewed by hyatt
        
        <rdar://problem/5138441> 
        GoogleDocs: Indented text looks like text that's been Quoted

        Demonstrates the bug:
        * editing/execCommand/5138441-expected.checksum: Added.
        * editing/execCommand/5138441-expected.png: Added.
        * editing/execCommand/5138441-expected.txt: Added.
        * editing/execCommand/5138441.html: Added.
        
        Added inline style declarations for indent blockquotes
        to match those that the engine creates:
        * editing/execCommand/indent-selection.html:
        * editing/execCommand/outdent-selection.html:

WebCore:

        Reviewed by hyatt

        <rdar://problem/5138441> 
        GoogleDocs: Indented text looks like text that's been Quoted
        
        GoogleDocs uses FormatBlock, blockquotes and a style rule
        for blockquotes to implement a "Quote Text" feature.  Styles
        intended only for those blockquotes were added to the 
        blockquotes that we use for indenting.

        * css/html4.css: Removed the webkit-indent-blockquote class rule.
        * editing/IndentOutdentCommand.cpp:
        (WebCore::createIndentBlockquoteElement): Use custom margins
        and turn off border and padding to override author rules for
        blockquotes.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@20925 268f45cc-cd09-0410-ab3c-d52691b4dbfc