[autoroll] Fix (?) flaky google3_test

Starting the goroutine doesn't seem to be necessary and only introduces
the possibility of race conditions.

Bug: skia:11346
Change-Id: If780f921e15f583527827c06a7aec10547aa4287
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/372476
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
diff --git a/autoroll/go/autoroll-google3/google3_test.go b/autoroll/go/autoroll-google3/google3_test.go
index ea1e186..5714ccd 100644
--- a/autoroll/go/autoroll-google3/google3_test.go
+++ b/autoroll/go/autoroll-google3/google3_test.go
@@ -41,7 +41,6 @@
 		RollerName:        "test-roller",
 	}, urlmock.Client(), nil)
 	require.NoError(t, err)
-	a.Start(ctx, time.Second, time.Second)
 	return ctx, a, gb, mockChild, func() {
 		gb.Cleanup()
 	}