Remove libs/clock in favor of luci-go/common/clock.

go/src/infra/libs/clock/systemtimer_test.go

Index: go/src/infra/libs/clock/systemtimer_test.go
diff --git a/go/src/infra/libs/clock/systemtimer_test.go b/go/src/infra/libs/clock/systemtimer_test.go
deleted file mode 100644
index 4ab9dfb6dc06f58205dcceec7de72873a7362f65..0000000000000000000000000000000000000000
--- a/go/src/infra/libs/clock/systemtimer_test.go
+++ /dev/null
@@ -1,65 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package clock
-
-import (
-	"testing"
-	"time"
-
-	. "github.com/smartystreets/goconvey/convey"
-)
-
-func TestSystemTimer(t *testing.T) {
-	t.Parallel()
-
-	Convey(`A systemTimer instance`, t, func() {
-		t := new(systemTimer)
-
-		Convey(`Should start with a nil channel.`, func() {
-			So(t.GetC(), ShouldBeNil)
-		})
-
-		Convey(`When stopped, should return inactive.`, func() {
-			So(t.Stop(), ShouldBeFalse)
-		})
-
-		Convey(`When reset`, func() {
-			active := t.Reset(1 * time.Hour)
-			So(active, ShouldBeFalse)
-
-			Convey(`When reset to a short duration`, func() {
-				active := t.Reset(1 * time.Microsecond)
-
-				Convey(`Should return active.`, func() {
-					So(active, ShouldBeTrue)
-				})
-
-				Convey(`Should trigger shortly.`, func() {
-					tm := <-t.GetC()
-					So(tm, ShouldNotResemble, time.Time{})
-				})
-			})
-
-			Convey(`When stopped, should return active and have a non-nil C.`, func() {
-				active := t.Stop()
-				So(active, ShouldBeTrue)
-				So(t.GetC(), ShouldNotBeNil)
-			})
-
-			Convey(`When stopped, should return active.`, func() {
-				active := t.Stop()
-				So(active, ShouldBeTrue)
-			})
-
-			Convey(`Should have a non-nil channel.`, func() {
-				So(t.GetC(), ShouldNotBeNil)
-			})
-
-			Reset(func() {
-				t.Stop()
-			})
-		})
-	})
-}