Bain Capital, KKR & Co. and Vornado Realty Trust stand to have their Toys “R” Us Inc. investment erased as the retailer they bought in 2005 for $7.5 billion seeks bankruptcy protection. The three firms and their co-investors sank $1.3 billion of equity into the takeover of the Wayne, New Jersey-based toy company, financing the rest with debt, according to company filings. The debt included senior loans in which they held a stake. Partly offsetting the loss is more than $470 million in fees and interest payments that Toys “R” Us awarded the firms over time.