Security update for Chromium (important)

This update for Chromium to version 67.0.3396.99 fixes multiple issues.

Security issues fixed (bsc#1095163):

• CVE-2018-6123: Use after free in Blink
• CVE-2018-6124: Type confusion in Blink
• CVE-2018-6125: Overly permissive policy in WebUSB
• CVE-2018-6126: Heap buffer overflow in Skia
• CVE-2018-6127: Use after free in indexedDB
• CVE-2018-6129: Out of bounds memory access in WebRTC
• CVE-2018-6130: Out of bounds memory access in WebRTC
• CVE-2018-6131: Incorrect mutability protection in WebAssembly
• CVE-2018-6132: Use of uninitialized memory in WebRTC
• CVE-2018-6133: URL spoof in Omnibox
• CVE-2018-6134: Referrer Policy bypass in Blink
• CVE-2018-6135: UI spoofing in Blink
• CVE-2018-6136: Out of bounds memory access in V8
• CVE-2018-6137: Leak of visited status of page in Blink
• CVE-2018-6138: Overly permissive policy in Extensions
• CVE-2018-6139: Restrictions bypass in the debugger extension API
• CVE-2018-6140: Restrictions bypass in the debugger extension API
• CVE-2018-6141: Heap buffer overflow in Skia
• CVE-2018-6142: Out of bounds memory access in V8
• CVE-2018-6143: Out of bounds memory access in V8
• CVE-2018-6144: Out of bounds memory access in PDFium
• CVE-2018-6145: Incorrect escaping of MathML in Blink
• CVE-2018-6147: Password fields not taking advantage of OS protections in
  Views
• CVE-2018-6148: Incorrect handling of CSP header (boo#1096508)
• CVE-2018-6149: Out of bounds write in V8 (boo#1097452)

The following tracked packaging changes are included:

• Require ffmpeg >= 4.0 (boo#1095545)