cmd/go: remove TestCoverageUsesActualSettingToOverrideEvenForRace

The test no longer passes as of https://golang.org/cl/43777, which
intentionally disables the feature that this test was checking for.
Nobody noticed since the test is not run in -short mode.

Updates #20435.

Change-Id: I64f37fd94c01f22ead88470b6d9bfe8a151ddb1c
Reviewed-on: https://go-review.googlesource.com/44650Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>

src/cmd/go/go_test.go

@@ -2204,29 +2204,6 @@ func TestCoverageUsesAtomicModeForRace(t *testing.T) {
 	checkCoverage(tg, data)
 }
 
-func TestCoverageUsesActualSettingToOverrideEvenForRace(t *testing.T) {
-	if testing.Short() {
-		t.Skip("don't build libraries for coverage in short mode")
-	}
-	if !canRace {
-		t.Skip("skipping because race detector not supported")
-	}
-
-	tg := testgo(t)
-	defer tg.cleanup()
-	tg.creatingTemp("testdata/cover.out")
-	tg.run("test", "-short", "-race", "-cover", "encoding/binary", "-covermode=count", "-coverprofile=testdata/cover.out")
-	data := tg.getStdout() + tg.getStderr()
-	if out, err := ioutil.ReadFile("testdata/cover.out"); err != nil {
-		t.Error(err)
-	} else {
-		if !bytes.Contains(out, []byte("mode: count")) {
-			t.Error("missing mode: count")
-		}
-	}
-	checkCoverage(tg, data)
-}
-
 func TestCoverageImportMainLoop(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()