Reviewed by Richard.

    Reviewed by Richard.

        <rdar://problem/3991652> REGRESSION (Mail): Deleting entire line in reply deletes extra blank line and moves insertion point

        * WebView.subproj/WebHTMLView.m:
        (-[WebHTMLView _deleteRange:killRing:prepend:smartDeleteOK:isTypingAction:]):
        (-[WebHTMLView _startDraggingImage:at:operation:event:sourceIsDHTML:DHTMLWroteData:]):
        (-[WebHTMLView _deleteWithDirection:granularity:killRing:isTypingAction:]):
        (-[WebHTMLView selectToMark:]):
        (-[WebHTMLView swapWithMark:]):
        (-[WebHTMLView transpose:]):
        (-[WebHTMLView _selectMarkedText]):
        (-[WebHTMLView _selectRangeInMarkedText:]):
        Adopt new default affinity of NSSelectionAffinityDownstream as of <rdar://problem/3937447>.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8573 268f45cc-cd09-0410-ab3c-d52691b4dbfc