Remove mojo/go - this is being developed in the mojo repo

mojo/go/tests/system_test.go

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package tests
-
-import "mojo/go/system/embedder"
-import "mojo/go/system/impl"
-import "mojo/public/go/mojo/edk/system"
-import "testing"
-
-func Init() {
-        embedder.InitializeMojoEmbedder()
-}
-
-func TestGetTimeTicksNow(t *testing.T) {
-        Init()
-        var c system.Core = impl.GetCore()
-        x := c.GetTimeTicksNow()
-        if x < 10 {
-                t.Error("Invalid GetTimeTicksNow return value")
-        }
-}