Reviewed by Darin Adler.

    Reviewed by Darin Adler.

        <rdar://problem/5511842> REGRESSION: Webkit stops responding while loading Apple Store Canada page (15304)

        Included the NSSynchronousURLConnection_PrivateMode mode, in addition to the default run loop modes
        as an acceptable mode when using performSelectorOnMainThread with our syncronous url callbacks.

        * platform/network/mac/ResourceHandleMac.mm:
        (-[WebCoreResourceHandleAsDelegate connection:willCacheResponse:]):
        Added NSSynchronousURLConnection_PrivateMode to the list of accepted modes.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@25940 268f45cc-cd09-0410-ab3c-d52691b4dbfc