CNN — The US government formally proposed a partial breakup of Google on Wednesday, urging a federal judge to force a sale of the company’s Chrome web browser after a landmark ruling this year finding that Google had violated US antitrust law with its search business. The request by the Justice Department and a group of states opens the door to the most significant antitrust penalties for a tech giant in a generation, targeting not only Google’s illegal monopoly in search but also its growing am...