Security update for Chromium (important)

This update for Chromium to version 68.0.3440.75 fixes multiple issues.

Security issues fixed (boo#1102530):

• CVE-2018-6153: Stack buffer overflow in Skia
• CVE-2018-6154: Heap buffer overflow in WebGL
• CVE-2018-6155: Use after free in WebRTC
• CVE-2018-6156: Heap buffer overflow in WebRTC
• CVE-2018-6157: Type confusion in WebRTC
• CVE-2018-6158: Use after free in Blink
• CVE-2018-6159: Same origin policy bypass in ServiceWorker
• CVE-2018-6161: Same origin policy bypass in WebAudio
• CVE-2018-6162: Heap buffer overflow in WebGL
• CVE-2018-6163: URL spoof in Omnibox
• CVE-2018-6164: Same origin policy bypass in ServiceWorker
• CVE-2018-6165: URL spoof in Omnibox
• CVE-2018-6166: URL spoof in Omnibox
• CVE-2018-6167: URL spoof in Omnibox
• CVE-2018-6168: CORS bypass in Blink
• CVE-2018-6169: Permissions bypass in extension installation
• CVE-2018-6170: Type confusion in PDFium
• CVE-2018-6171: Use after free in WebBluetooth
• CVE-2018-6172: URL spoof in Omnibox
• CVE-2018-6173: URL spoof in Omnibox
• CVE-2018-6174: Integer overflow in SwiftShader
• CVE-2018-6175: URL spoof in Omnibox
• CVE-2018-6176: Local user privilege escalation in Extensions
• CVE-2018-6177: Cross origin information leak in Blink
• CVE-2018-6178: UI spoof in Extensions
• CVE-2018-6179: Local file information leak in Extensions
• CVE-2018-6044: Request privilege escalation in Extensions
• CVE-2018-4117: Cross origin information leak in Blink

The following user interface changes are included:

• Chrome will show the "Not secure" warning on all plain HTTP pages