1.8 is not stable; upgrading to 1.4 unless there is a compelling reason to go to 1.8.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/portage-stable/+/3a8bea04020c925168a3a3235c3ea6c7c10a8942

commit 3a8bea04020c925168a3a3235c3ea6c7c10a8942
Author: Lann Martin <lannm@google.com>
Date: Fri Jun 02 23:59:35 2017

shared-mime-info: upgraded package to upstream

Upgraded x11-misc/shared-mime-info to version 1.4 on amd64, arm, x86

BUG= chromium:710116 
TEST=precq passed

Change-Id: Ib4a04aef2b123900449504c4f8c5e4d5b4674f82
Reviewed-on: https://chromium-review.googlesource.com/521726
Commit-Ready: Lann Martin <lannm@chromium.org>
Tested-by: Lann Martin <lannm@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>

[add] https://crrev.com/3a8bea04020c925168a3a3235c3ea6c7c10a8942/metadata/md5-cache/x11-misc/shared-mime-info-1.4
[modify] https://crrev.com/3a8bea04020c925168a3a3235c3ea6c7c10a8942/x11-misc/shared-mime-info/metadata.xml
[rename] https://crrev.com/3a8bea04020c925168a3a3235c3ea6c7c10a8942/x11-misc/shared-mime-info/shared-mime-info-1.4.ebuild
[delete] https://crrev.com/c62a118385b62467bf70af79bed878ccfb7a0e44/metadata/md5-cache/x11-misc/shared-mime-info-1.3
[modify] https://crrev.com/3a8bea04020c925168a3a3235c3ea6c7c10a8942/x11-misc/shared-mime-info/Manifest