Update version of Go to 1.5

examples/go/echo_client.go

 // Copyright 2015 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 main
 
 import (
         "fmt"
         "log"
 
-        "golang.org/x/mobile/app"
-
         "mojo/public/go/application"
         "mojo/public/go/bindings"
         "mojo/public/go/system"
 
         "examples/echo/echo"
 )
 
 //#include "mojo/public/c/system/types.h"
 import "C"
 
@@ skipping 20 matching lines @@
 func (delegate *EchoClientDelegate) Quit() {
 }
 
 //export MojoMain
 func MojoMain(handle C.MojoHandle) C.MojoResult {
         application.Run(&EchoClientDelegate{}, system.MojoHandle(handle))
         return C.MOJO_RESULT_OK
 }
 
 func main() {
-        app.Run(app.Callbacks{})
 }