webdav: remove runtime check for Go 1.4 or earlier.

During the Go 1.5 development cycle, this package used to require the
standard library's encoding/xml package from Go 1.5 or later, but
https://go-review.googlesource.com/#/c/12772/ (which was submitted in
July 2015) made an internal fork of encoding/xml, as some
namespace related changes introduced in the Go 1.5 cycle were rolled
back in response to https://github.com/golang/go/issues/11841

Thus, this "go1.4" runtime check is no longer necessary. In the long
term, this package should use the standard library's version, and the
internal fork deleted, once https://github.com/golang/go/issues/13400 is
resolved. We could re-introduce a similar check at that time, although
it could be done at compile time (via a "go1.7" build tag) instead of at
runtime.

Change-Id: I18258443aa3d9b519e23106aedb189f25c35495d
Reviewed-on: https://go-review.googlesource.com/21634
Reviewed-by: Andrew Gerrand <adg@golang.org>

webdav/webdav.go

@@ -9,35 +9,14 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"log"
 	"net/http"
 	"net/url"
 	"os"
 	"path"
-	"runtime"
 	"strings"
 	"time"
 )
 
-// Package webdav's XML output requires the standard library's encoding/xml
-// package version 1.5 or greater. Otherwise, it will produce malformed XML.
-//
-// As of May 2015, the Go stable release is version 1.4, so we print a message
-// to let users know that this golang.org/x/etc package won't work yet.
-//
-// This package also won't work with Go 1.3 and earlier, but making this
-// runtime version check catch all the earlier versions too, and not just
-// "1.4.x", isn't worth the complexity.
-//
-// TODO: delete this check at some point after Go 1.5 is released.
-var go1Dot4 = strings.HasPrefix(runtime.Version(), "go1.4.")
-
-func init() {
-	if go1Dot4 {
-		log.Println("package webdav requires Go version 1.5 or greater")
-	}
-}
-
 type Handler struct {
 	// Prefix is the URL path prefix to strip from WebDAV resource paths.
 	Prefix string

webdav/xml_test.go

@@ -348,10 +348,6 @@ func TestReadPropfind(t *testing.T) {
 }
 
 func TestMultistatusWriter(t *testing.T) {
-	if go1Dot4 {
-		t.Skip("TestMultistatusWriter requires Go version 1.5 or greater")
-	}
-
 	///The "section x.y.z" test cases come from section x.y.z of the spec at
 	// http://www.webdav.org/specs/rfc4918.html
 	testCases := []struct {