SEOUL (Reuters) -Samsung Electronics Co Ltd reported a likely 96% plunge in second-quarter operating profit on Friday, largely in line with forecasts, as an ongoing chip glut drives large losses in the tech giant's key business despite a supply cut. The world's largest memory chip and smartphone maker estimated its operating profit fell to 600 billion won ($459 million) in April to June, from 14.1 trillion won a year earlier in a short preliminary earnings statement. It would be Samsung's lowest profit for any quarter since a 590 billion won profit in the first quarter of 2009...