Remove third_party/golang.org/x/mobile as it is no longer used with Go 1.5.

third_party/go/src/golang.org/x/mobile/audio/alc/alc.go

-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build darwin
-
-// Package alc provides OpenAL's ALC (Audio Library Context) bindings for Go.
-package alc
-
-/*
-#cgo darwin   CFLAGS:  -DGOOS_darwin
-#cgo darwin   LDFLAGS: -framework OpenAL
-
-#ifdef GOOS_darwin
-#include <stdlib.h>
-#include <OpenAL/alc.h>
-#endif
-*/
-import "C"
-import "unsafe"
-
-// Error returns one of these values.
-const (
-        InvalidDevice  = 0xA001
-        InvalidContext = 0xA002
-        InvalidEnum    = 0xA003
-        InvalidValue   = 0xA004
-        OutOfMemory    = 0xA005
-)
-
-// Device represents an audio device.
-type Device struct {
-        d *C.ALCdevice
-}
-
-// Error returns the last known error from the current device.
-func (d *Device) Error() int32 {
-        return int32(C.alcGetError(d.d))
-}
-
-// Context represents a context created in the OpenAL layer. A valid current
-// context is required to run OpenAL functions.
-// The returned context will be available process-wide if it's made the
-// current by calling MakeContextCurrent.
-type Context struct {
-        c *C.ALCcontext
-}
-
-// Open opens a new device in the OpenAL layer.
-func Open(name string) *Device {
-        n := C.CString(name)
-        defer C.free(unsafe.Pointer(n))
-        return &Device{d: C.alcOpenDevice((*C.ALCchar)(unsafe.Pointer(n)))}
-}
-
-// Close closes the device.
-func (d *Device) Close() bool {
-        return C.alcCloseDevice(d.d) == 1
-}
-
-// CreateContext creates a new context.
-func (d *Device) CreateContext(attrs []int32) *Context {
-        // TODO(jbd): Handle attributes.
-        c := C.alcCreateContext(d.d, nil)
-        return &Context{c: c}
-}
-
-// MakeContextCurrent makes a context current process-wide.
-func MakeContextCurrent(c *Context) bool {
-        return C.alcMakeContextCurrent(c.c) == 1
-}