Remove getYouTubeId from util.go.

This bit of code has long been moved to the YouTube parser package.

util.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"net/url"
 	"regexp"
 	"strings"
 )
@@ -28,34 +27,3 @@ func stripIrcFormatting(text string) string {
 	text = rxIrcColor.ReplaceAllLiteralString(text, "")
 	return text
 }
-
-func getYouTubeId(uri *url.URL) string {
-	u := &(*uri)
-	u.Scheme = strings.ToLower(u.Scheme)
-	u.Host = strings.ToLower(u.Host)
-
-	// Must be an HTTP URL
-	if u.Scheme != "http" && u.Scheme != "https" {
-		return ""
-	}
-
-	// Remove www. prefix from hostname
-	if strings.HasPrefix(u.Host, "www.") {
-		u.Host = u.Host[4:]
-	}
-
-	switch strings.ToLower(u.Host) {
-	case "youtu.be":
-		// http://youtu.be/{id}
-		if s, err := url.QueryUnescape(strings.TrimLeft(u.Path, "/")); err == nil {
-			return s
-		} else {
-			return ""
-		}
-	case "youtube.com":
-		// http://youtube.com/watch?v={id}
-		return u.Query().Get("v")
-	}
-
-	return ""
-}