NEW DELHI—Google accused India’s antitrust regulator in court on Friday of being a “habitual offender” by leaking confidential information of cases it was examining, an accusation the watchdog rejected. The Times of India and Reuters reported on Saturday that an investigation by the Competition Commission of India (CCI) had found that Alphabet Inc.’s Google abused the dominant position of its Android operating system in India, using its “huge financial muscle” illegally to hurt competitors. In an unusual move on Thursday, Google sued the CCI in the Delhi High Court, saying in a statement it was “protesting against the breach of confidence” and “to prevent any further unlawful disclosures of confidential findings.” In Friday’s near hour-long court showdown, Google’s lawyer, Abhishek Manu Singhvi, accused the CCI of leaking information repeatedly, saying it did so to “give a dog a bad name in advance and then hang him by these selective leakages.” …