Unique tab ID appended to user agent string in Chrome for iOS?

As I was testing my web app in Chrome for iOS (both iPhone and iPad), I noticed a weird ID appended to user agent string, e.g.: alert(navigator.userAgent) would produce something like this (note the "3810AC74-327F-43D7-A905-597FF9FDFEAB" part at the end): Mozilla/5.0 (iPhone; CPU iPhone OS 5_1_1 like Mac OS X; en-us) AppleWebKit/534.46.0 (KHTML, like Gecko) CriOS/21.0.1180.77 Mobile/9B206 Safari/7534.48.3 (3810AC74-327F-43D7-A905-597FF9FDFEAB) This ID seems to be tab specific and persists even when going to a different site. My question is, if anyone knows anything about this and what it may be used for? **Update:** This GUID was appended to [overcome the limitations of UIWebView](https://code.google.com/p/chromium/issues/detail?id=355541). Kudos to [eric](https://stackoverflow.com/users/448268/eric) for pointing this out in the comments.

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