        Reviewed by Oliver
        Reviewed by Oliver

        <rdar://problem/5487048> - ASSERT in stress test in IconDatabase

        If a PageURLRecord went away, it never clears its URL from the IconRecord it retained.

        * loader/icon/PageURLRecord.cpp:
        (WebCore::PageURLRecord::~PageURLRecord): Set the icon record to 0, clearing the page url
        * loader/icon/PageURLRecord.h: Add the destructor



git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@25603 bbb929c8-8fbe-4397-9dbb-9b2b20218538
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