chromium: 67.0.3396.62 -> 67.0.3396.87

Contains fixes for CVE-2018-6148 [0] and CVE-2018-6149 [1].

Also add a patch to fix one problem with 68 (Beta) build. I'm still
working on fixing Beta.

[0] https://chromereleases.googleblog.com/2018/06/stable-channel-update-for-desktop.html
[1] https://chromereleases.googleblog.com/2018/06/stable-channel-update-for-desktop_12.html