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/app/stdio_android.go

-// Copyright 2014 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.
-
-package app
-
-// Android redirects stdout and stderr to /dev/null.
-// As these are common debugging utilities in Go,
-// we redirect them to logcat.
-//
-// Unfortunately, logcat is line oriented, so we must buffer.
-
-/*
-#cgo LDFLAGS: -llog
-#include <android/log.h>
-#include <string.h>
-*/
-import "C"
-
-import (
-        "bufio"
-        "log"
-        "os"
-        "unsafe"
-)
-
-var (
-        ctag    = C.CString("GoStdio")
-        ctagLog = C.CString("GoLog")
-)
-
-type infoWriter struct{}
-
-func (infoWriter) Write(p []byte) (n int, err error) {
-        cstr := C.CString(string(p))
-        C.__android_log_write(C.ANDROID_LOG_INFO, ctagLog, cstr)
-        C.free(unsafe.Pointer(cstr))
-        return len(p), nil
-}
-
-func lineLog(f *os.File, priority C.int) {
-        const logSize = 1024 // matches android/log.h.
-        r := bufio.NewReaderSize(f, logSize)
-        for {
-                line, _, err := r.ReadLine()
-                str := string(line)
-                if err != nil {
-                        str += " " + err.Error()
-                }
-                cstr := C.CString(str)
-                C.__android_log_write(priority, ctag, cstr)
-                C.free(unsafe.Pointer(cstr))
-                if err != nil {
-                        break
-                }
-        }
-}
-
-func init() {
-        log.SetOutput(infoWriter{})
-        // android logcat includes all of log.LstdFlags
-        log.SetFlags(log.Flags() &^ log.LstdFlags)
-
-        r, w, err := os.Pipe()
-        if err != nil {
-                panic(err)
-        }
-        os.Stderr = w
-        go lineLog(r, C.ANDROID_LOG_ERROR)
-
-        r, w, err = os.Pipe()
-        if err != nil {
-                panic(err)
-        }
-        os.Stdout = w
-        go lineLog(r, C.ANDROID_LOG_INFO)
-}