Update Chromium

dfaf156 Remove third_party/afl
059d826 [Backport] Initialize RenderSandboxHostLinux in --no-zygote mode to not crash.
16b932b Add .gitignore for *.pyc

Task-number: QTBUG-61954
Change-Id: Ib10d09b8c0a771fb9b200a1947dbf9bb320cb1f2
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>