Add support for operator <= to IdType.

This is a followup to r622715 to simplify some of the comparisons done
in ChildProcessSecurityPolicyImpl on BrowsingInstanceId, which is an
IdType.

Bug: 905513
Change-Id: I7c0fc4c3f649d6cf851188b0a6560489067806b9
Reviewed-on: https://chromium-review.googlesource.com/c/1413811
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Ɓukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623782}
2 files changed