TOKYO (Reuters) - A dream team of movie stars from China and Japan gathered in Tokyo on Monday to promote "Memoirs of a Geisha," the first big-budget Hollywood romance to feature an almost entirely Asian cast. But a day ahead of the world premiere, some in Japan were wondering why homegrown talent was shut out of the leading roles in a film that celebrates Japan's unique culture. Harsher comments have come from China, where bitter feelings over Japan's 1931-45 occupation of parts of the country make the idea of Chinese playing geisha unacceptable to some. Based on a best-selling novel,...