Reviewed by ggaren and harrison
        
        <rdar://problem/4744008>
        9A270: Mail crashes when I try to paste large items from Safari
        
        * editing/pasteboard/4744008-expected.txt: Added.
        * editing/pasteboard/4744008.html: Added.

WebCore:

        Reviewed by ggaren and harrison
        
        <rdar://problem/4744008>
        9A270: Mail crashes when I try to paste large items from Safari

        * editing/ReplaceSelectionCommand.cpp:
        (WebCore::ReplaceSelectionCommand::removeRedundantStyles):
        Even though we put nodes in the hash map in pre-order, they don't necessary
        come out of the iterator that way.  If a node is a redundant style span
        and one of its pruned ancestors comes off the hash map after it, and that
        ancestor is a redundant style span or font tag, we will try to remove it
        even though it has already been removed and we'll crash.
        The test case added with the fix depends on our hash map implementation
        because it requires that a particular redundant style span come out of 
        the iterator before its parent. So, it may eventually not provide 
        coverage for the fix.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@17051 268f45cc-cd09-0410-ab3c-d52691b4dbfc