BOSTON (Reuters) - Hedge fund manager David Einhorn told investors that he thinks performance chemicals company Chemours Co will see its earnings grow as prices for titanium dioxide (TiO2), used in the food and cosmetic industries, recover.Einhorn's comments, in a letter sent to Greenlight Capital investors on Tuesday morning and seen by Reuters, helped the company's stock price climb 6.14 percent to $9.33."We expect the stock to appreciate as investors refocus on the earnings power of the business, which we think will approach $2.00 in 2017," the letter said.The hedge fund sees room for cost cuts at Chemours, which was...