LOS ANGELES - Walt Disney Co. Vice Chairman Roy E. Disney has agreed to a future sale of 7.5 million Disney shares, a transaction that is netting the son of company co-founder Roy O. Disney $125 million. Disney, through a family trust he established, agreed to a "variable prepaid forward" contract with investment firm Credit Suisse First Boston, Disney said Wednesday. Disney, 73, said he sold the shares to cash in a portion of his holdings "to meet other investment objectives." Under the terms of the agreement, CSFB paid Disney $21.751 per share, then resold the shares into the public...