Log Message:
Update to 52.8.0

Changelog:
#CVE-2018-5183: Backport critical security fixes in Skia
#CVE-2018-5184: Full plaintext recovery in S/MIME via chosen-ciphertext attack
#CVE-2018-5154: Use-after-free with SVG animations and clip paths
#CVE-2018-5155: Use-after-free with SVG animations and text paths
#CVE-2018-5159: Integer overflow and out-of-bounds write in Skia
#CVE-2018-5161: Hang via malformed headers
#CVE-2018-5162: Encrypted mail leaks plaintext through src attribute
#CVE-2018-5170: Filename spoofing for external attachments
#CVE-2018-5168: Lightweight themes can be installed without user interaction
#CVE-2018-5174: Windows Defender SmartScreen UI runs with less secure behavior
 for downloaded files in Windows 10 April 2018 Update
#CVE-2018-5178: Buffer overflow during UTF-8 to Unicode string conversion
 through legacy extension
#CVE-2018-5185: Leaking plaintext through HTML forms
#CVE-2018-5150: Memory safety bugs fixed in Firefox 60, Firefox ESR 52.8,
 and Thunderbird 52.8