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         Reviewed by Darin Adler.
        
        <rdar://problem/6834876> Don't use BlockExceptions macros until QTKit supports 
        QTMoviePreferredTransformAttribute

        * platform/graphics/mac/MediaPlayerPrivateQTKit.mm:
        (WebCore::MediaPlayerPrivate::cacheMovieScale): use @try and @catch instead of 
        BEGIN_BLOCK_OBJC_EXCEPTIONS and END_BLOCK_OBJC_EXCEPTIONS for builds of QTKit 
        that throw an exception on QTMovieCurrentSizeAttribute but don't support 
        QTMoviePreferredTransformAttribute



git-svn-id: svn://svn.chromium.org/blink/trunk@42952 bbb929c8-8fbe-4397-9dbb-9b2b20218538