Remove browser module Version

We forgot to remove the exported field after the following change:
710e616

api/browser.go

@@ -11,5 +11,4 @@ type Browser interface {
 	NewPage(opts goja.Value) (Page, error)
 	On(string) (bool, error)
 	UserAgent() string
-	Version() string
 }

browser/mapping.go

@@ -716,13 +716,6 @@ func mapBrowser(vu moduleVU, wsURL string, isRemoteBrowser bool) mapping { //nol
 			}
 			return b.UserAgent(), nil
 		},
-		"version": func() (string, error) {
-			b, err := getOrInitBrowser(ctx, bt, vu, wsURL, isRemoteBrowser)
-			if err != nil {
-				return "", err
-			}
-			return b.Version(), nil
-		},
 		"newPage": func(opts goja.Value) (mapping, error) {
 			b, err := getOrInitBrowser(ctx, bt, vu, wsURL, isRemoteBrowser)
 			if err != nil {

browser/module.go

@@ -30,7 +30,6 @@ type (
 	JSModule struct {
 		Browser *goja.Object
 		Devices map[string]common.Device
-		Version string
 	}
 
 	// ModuleInstance represents an instance of the JS module.

tests/browser_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"os"
 	"path/filepath"
-	"regexp"
 	"runtime"
 	"strings"
 	"syscall"
@@ -115,14 +114,6 @@ func TestBrowserOn(t *testing.T) {
 	})
 }
 
-// This only works for Chrome!
-func TestBrowserVersion(t *testing.T) {
-	const re = `^\d+\.\d+\.\d+\.\d+$`
-	r, _ := regexp.Compile(re)
-	ver := newTestBrowser(t).Version()
-	assert.Regexp(t, r, ver, "expected browser version to match regex %q, but found %q", re, ver)
-}
-
 // This only works for Chrome!
 // TODO: Improve this test, see:
 // https://github.com/grafana/xk6-browser/pull/51#discussion_r742696736