Chrome 稳定版更新至 48.0.2564.109 版本

Chrome 稳定版更新至 48.0.2564.109 版本，主要是安全的更新，包含 6 个安全问题更新：

[$7500][546677] High CVE-2016-1622: Same-origin bypass in Extensions. Credit to anonymous.

[$7500][577105] High CVE-2016-1623: Same-origin bypass in DOM. Credit to Mariusz Mlynski.

[$TBD][583607] High CVE-2016-1624: Buffer overflow in Brotli. Credit to lukezli.

[$1000][509313] Medium CVE-2016-1625: Navigation bypass in Chrome Instant. Credit to Jann Horn.

[571480] Medium CVE-2016-1626: Out-of-bounds read in PDFium. Credit to anonymous, working with HP's Zero Day Initiative.