Reviewed by Mitz.

        - fix https://bugs.webkit.org/show_bug.cgi?id=19556
          REGRESSION (r34544): Crash while visiting bigglook.com

        This fix eliminates the crash, but the logic remaining seems a little strange.
        We create an IconRecord and then immediately destroy it. Worth taking another
        look at this later.

        * loader/icon/IconDatabase.cpp:
        (WebCore::IconDatabase::setIconDataForIconURL): Added code to remove the icon
        just as in the other cases where we might be holding the single reference to it.
        (WebCore::IconDatabase::setIconURLForPageURL): Fixed comment typo.
        (WebCore::IconDatabase::writeToDatabase): Removed unused local variable.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@34575 268f45cc-cd09-0410-ab3c-d52691b4dbfc