Revert "os: handle long path in RemoveAll for windows"

This reverts CL 214437.

Does not fix the issue, and the test was wrong so it did not detect that it did not fix the issue.

Updates #36375

Change-Id: I6a4112035a1e90f4fdafed6fdf4ec9dfc718b571
Reviewed-on: https://go-review.googlesource.com/c/go/+/214601Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/os/removeall_noat.go

@@ -27,7 +27,6 @@ func removeAll(path string) error {
 	}
 
 	// Simple case: if Remove works, we're done.
-	path = fixLongPath(path)
 	err := Remove(path)
 	if err == nil || IsNotExist(err) {
 		return nil

src/os/removeall_test.go

@@ -206,26 +206,6 @@ func TestRemoveAllLongPath(t *testing.T) {
 	}
 }
 
-func TestRemoveAllLongPathWindows(t *testing.T) {
-	startPath, err := ioutil.TempDir("", "TestRemoveAllLongPath-")
-	if err != nil {
-		t.Fatalf("Could not create TempDir: %s", err)
-	}
-	defer RemoveAll(startPath)
-
-	// Make a long path
-	err = MkdirAll(filepath.Join(startPath, "foo", "bar", strings.Repeat("a", 150),
-		strings.Repeat("b", 150)), ModePerm)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	err = RemoveAll("foo")
-	if err != nil {
-		t.Fatal(err)
-	}
-}
-
 func TestRemoveAllDot(t *testing.T) {
 	prevDir, err := Getwd()
 	if err != nil {