iPhone users will find a new type of application in the iTunes App Store this week: Web browsers. The new browsers showed up on Apple’s virtual online shelves late Tuesday. The additions are noteworthy — at first blush, they appear to fly in the face the device maker’s previously stated policy of not approving for sale applications that duplicate functionalities available through Apple’s proprietary software. In this instance, Apple’s Mobile Safari browser has been the only application of that nature available for the iPhone since its launch in June 2007.