By Lisa Richwine and Dawn Chmielewski LOS ANGELES (Reuters) -Walt Disney signaled on Thursday it was girding for a potentially prolonged fight with YouTube TV over distribution of its television networks, worrying investors about the outlook for its already declining TV business and pushing its shares down 8%. The company also missed quarterly revenue expectations as the cable weakness overshadowed strong growth in the company's streaming and parks businesses that powered a profit beat. On a post-earnings call, Chief Financial Officer Hugh Johnston told analysts Disney has "built a hedge" into its forecasts assuming the negotiations could drag on. Disney's networks disappeared from YouTube TV – the fourth-largest pay-TV provider in the U.S. with about 10 million subscribers – on October 30

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