Security update for chromium

This update Chromium 53.0.2785.143 fixes the following issues (boo#1002140)

- CVE-2016-5177: Use after free in V8
- CVE-2016-5178: Various fixes from internal audits

The following bugfix changes are included:

- Export GDK_BACKEND=x11 before starting chromium, ensuring that it's started as an Xwayland client (boo#1001135).
- Changes to Sandbox to fix crashers on tumbleweed (boo#999091)

Fixed bugs
bnc#1001135
Chromium crashes in gtk3 on wayland session
bnc#1002140
Chromium update 53.0.2785.143 contains 3 security fixes
bnc#999091
chromium on Tumbleweed crashes on startup
Selected Binaries
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