swarming: inline Less function
swarming: inline Less function

to remove a type used only once.

Change-Id: I314e3f42d671cc72113ace8014bd65f051fc2f4d
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2646493
Reviewed-by: Ye Kuang <1cd89f22f3967fc3dcb883b53940be4b98ec483f@google.com>
Commit-Queue: Ye Kuang <1cd89f22f3967fc3dcb883b53940be4b98ec483f@google.com>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go