Reviewed by John.

    Reviewed by John.

        - fixed <rdar://problem/4019823> Seed: Control-Y doesn't work

        * WebView.subproj/WebHTMLView.m:
        (-[WebHTMLView _deleteWithDirection:granularity:killRing:isTypingAction:]): Call _handleKillRing
        after setting the selection, since it uses the selection to get the text.
        (-[WebHTMLView _insertText:selectInsertedText:]): Check for empty string to avoid an assertion
        on the other side of the bridge when you yank the empty string.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8697 268f45cc-cd09-0410-ab3c-d52691b4dbfc